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Infectious Disease > Gram Positive Bugs > Flashcards

Gram Positive Bugs Flashcards

1
Q

Staph is grouped how?

A

clusters/clumps like grapes

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2
Q

Catylase associated with what kind of bacteria?

A

staph aureas

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3
Q

Strep grouped how?

A

Bunches in lines or in pairs

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4
Q

Buzz word for Diphtheria?

A

grey pseudomembrane

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5
Q

Where do we see anthrax?

A

soil, sheep, goats, cattle

bioterrism

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6
Q

Classifications of Bacteria

A

Reaction to certain types of stains

Physiologic structure

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7
Q

What are the different types of shapes in bacterial infetions?
5

A 
Bacillus are Rod shaped
Coccus is sphere shaped
Spirillum are spiral shaped
Streptococci are cocci in chains
Staphylococci are cocci in clusters
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8
Q

Name the gram positive bacteria we covered?

6

A
  1. Staphylococcus sp.
  2. Streptococcus sp.
  3. Clostridium Botulinum (anerobe)
  4. Corynebacterium Diptheriae (Diphtheria)- grey pseudomembrane
  5. Clostridium Tetanus (Tetanus)
  6. Bacillus antracis (Anthrax)-soil, sheep, goats, cattle
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9
Q

Stpah aureus is the only staph that produces what?

A

only one that produced coagulase)-produces exotoxins

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10
Q

Name three things the exotoxins in staph aureus cause?

A
  1. food poisening(GI)
  2. scalded skin syndrome(causes skin to slough off
  3. toxic shock syndrome- pinpoint rash on ab
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11
Q

What instances should we worry about Staph aureus infection?

4

A 
foley/catheter
iv line infections
prothetic valves
knee replacement
etc
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12
Q

What is s. saprophyticus associated with?

A

UTIs

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13
Q

Strep Pyogenes is what kind of strep?

Lancefield antigen?
Hemolytic?

A

Group A beta-hemolytic strep

Positive
Yes, partially

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14
Q

Streptococcus agalactiae is what kind of Strep?

What is it mainly known to cause?
Lancefield anitgen?
Hemolytic?

A

Group B

neonatal meningitis in babies
Positive
Yes

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15
Q

Streptococcus pneumoniae (Pneumococcus) is what kind of strep?

What is it mainly known to cause?3
Lancefield anitgen?
Hemolytic?

A

GP diplococci

In adults:
CAP!! sudden onset shaking chills, rust colored sputum,
In chidlren: OM, sinusistis

NO
NO

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16
Q

Streptococcus viridans is what kind of strep?

What is it mainly known to cause?
3

Where is strep viridans normal flora in your body?

Lancefield anitgen?
Hemolytic?

A

Alpha hemolytic

Dental infections
Endocarditis (prothetic valve)
Abcesses

GI

NO
Yes, partially (green)

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17
Q

Enterococcus is what kind of strep?

Where does it like to hang out (normal flora)?

What is it resistance to?

Lancefield?
Hemolytic?

A

(Group D strep)

Bilius areas, gall bladder/liver etc

vanco and amp.

Yes
Yes

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18
Q

Common Bacterial Infections
caused by gram pos bacteria?
3

A

Skin-first think staph aureus
Soft tissue
Bone

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19
Q

What do localized infections not do that differentiates them from systemic infecitons?

A

Organism does not spread through the lymphatic system or reach the bloodstream
-infection subsides due to host defenses

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20
Q

Which pathways do bacteria take to become a generalized or systemic infection?
3

A

via tissues, lymphatic system, bloodstream

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21
Q

Examples of localized infections? 2

A

Cellulitis

Erysipelas- strep

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22
Q

Potentially lethal infections that were noted?

3

A

Necrotizing fasciitis (flesh eating disease)
Myonecrosis (gas gangrene or Clostridial myonecrosis)
Pyomyositis (abscess from bacterial infection of skeletal muscles)

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23
Q

What do we need to make sure we do with cellulitis infections?

A

mark it with a sharpy, treat cellulitis aggressively

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24
Q

Most staphylococcus are harmless and reside where?

A

skin and mucous membranes

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25
Q

What is Methicillin-resistant Staphylococcus Aureus resistant to?

What does MRSA look like right awa?

A

beta lactams

Spider bite but it develops and spreads fast to become very dangerous

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26
Q

How do we further divide Staphylococcus bacteria?

2

A

Further divided into ability to produce coagulase
1. Coagulase positive species (virulence)
Staphylococcus aureus (common nasal flora)
2. Coag Negative species
Staphylococcus epidermidis (universal skin flora)

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27
Q

Pathogenicity of S. aureus

Cutaneous infections?4

Deep infections? 5

Toxin mediated infections? 3

A 
1. Cutaneous infections – 
Folliculitis (boils)
furuncle
burns 
wounds
2. Deep infections – 
Osteomyelitis, 
abscesses, 
pneumonia, 
endocarditis, 
septicemia
  1. Toxin mediated infections –
    Staphylococcal scalded skin syndrome (SSSS),
    Toxic Shock Syndrome (TSS),
    Food poisoning (in 1-8hr, vomiting ,diarrhea, nausea, self limited )
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28
Q

People with massive burns often die of what?

A

Staph infections

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29
Q

Skin and soft tissue infections most common in what kind of pts?

A

immunocompetent host

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30
Q

What is the most common cutaneous staph aureus infection?

A

Abcesses

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31
Q

Other staph aureus skin infections?

4

A
  1. Folliculitis
  2. Mastitis (infection of the breast when nursing)- nights sweats ad high fevers
  3. Wound Infections
  4. Infected IV catheter sites
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32
Q

How would we treat mastitis?

A

treat with antibiotics and excessive nursing have to drain it. wont cause problems with babies

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33
Q

How would we diagnose septic arthritis?

A

injury to the area/staph. red swollen joint you need to tap and see what you have.

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34
Q

What major systemic infections does Staph aureus cause?

3

A

Bacteremia/septicemia/endocarditis
Pneumonia
Musculoskeletal: septic arthritis

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35
Q

What type of MRSA is associated with invasive procedures or devices?

What kind of MRSA can begin as a painful skin boil. Spread by skin to skin contact. At risk populations include high school wrestlers, child care workers and people who live in crowded conditions?

A

HA-MRSA Health care associated

CA-MRSA: Community Associated among healthy people

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36
Q

How do we treat MRSA?
3 drug choices
2 (timeline)

A
  1. bactrim/sulfas, then 2. clinda or doxy. then 3. vanco

aggressive and early

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37
Q

How should we treat MRSA of the nares?

A

Bactroban (Mupirocin) ointment in the nose qd

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38
Q

Full body wash (Rules of 3) is called what?

how often do we use it?

A

(Hibiclens)

3 times a day for 3 days then 3 times a week for 3 weeks

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39
Q

Features of Cellulitis?

6

A 
Red
swollen
warm to touch
no areas of pus!
painful 
tender
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40
Q

What is the most common bug that causes cellulitis?

How does it manifest?

A

Group A strep

Follws an nnocuous or unrecognized injury. Inflammation is diffuse spreading along the tissue

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41
Q

When does staph aureus usually cause cellulitis?

2

A

Usually with a wound or penetrating trauma

Localized ABCESS becomes surrounded by cellulitis

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42
Q

What is the current antibiotic choice for cellulitis?

3

A

Clindamycin, Doxycycline, or Trimethoprim-Sulfa (“Bactrim, Septra”)

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43
Q

If you have severe cellulitisand its spreading quickly and systemic symptoms- fever what should we go with?

A

go with IV antibiotics go right to vanco. hospitalize them

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44
Q

Hospital admission criteria for cellulitis?

5

A
  1. animal bite on pts face or hand
  2. area of skin involvement is more than 50% of limb or torso or more than 10% of total body surface
  3. Coexisitng morbidities
  4. Compirmised host
  5. If they need IV ABX
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45
Q

When the tissue in the area of cellulitis turns to pus under the surface of the skin, the collection of pus is termed what?

A

an abcess

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46
Q

What does an abcess consist of?
2

What is the most common bacteria in the abcess?

A

The pus in the abscess consists of dead, liquified tissue, billions of white blood cells

“staph”, or Staphylococcus aureus
Many other bacteria that can cause abscesses

47
Q

Whats the difference between a empyema and an abcess?

A

Must be distinguished from empyemas which are accumulations of pus in a preexisting rather than a newly formed anatomical cavity.

48
Q

Clinical features of abcesses?

3

A
  1. superficial like on skin, subcutaneous tissues, on the hand
  2. Infections of the head and neck
  3. Deep seated infections
49
Q

Example of abcesses of the head and neck?

A

suppurative parotitis (acute infection of the parotid)

50
Q

Example of deep seated infections that cause abcesses?

4

A

hepatic abscess
splenic abscess
sub-phrenic abscess
rectal abscess

51
Q

How will the center of the abcess feel?

A

soft center. feels like fluid underneath

52
Q

Treatment of Abscesses?

2

A
  1. I and D
    ? ABX- but probably do it anyway.
    If the abscess has a lot of cellulitis around it, an antibiotic is probably needed.
    Abscesses have to be drained.
  2. Antibiotics cannot penetrate w/o drainage. They do not get into the site without it being drained first
53
Q

When the bacteria in a cellulitis or abscess start spreading quickly between the fat layer and the muscle underneath it is termed what?

A

necrotizing fasciitis

Fasciitis means the infection is spreading along the space between the fat and the muscle underneath

54
Q

How does necrotizing fasciitis kill tissue?

A

The infection cuts off the blood supply to the tissue above it and the tissue dies
The bacteria may also enter the bloodstream

55
Q

Treatment of Necrotizing Fasciitis?

3

What are the main bugs associated with it?
4

A
  1. Have to cut it out and keep cutting it out until the bacteria stops spreading
  2. Antibiotics help, but they will NOT cure the infection
    - -Antibiotics for a minimum of 3 wks

Empiric antibiotics to cover anaerobes,
gram negative bacilli, streptococci, and
Staph aureus

56
Q

What is myonecrosis?

What bug causes it?

Whats its incubation period?

Clinical presentation? 4

How should we treat it?
4
(2 drug choices)

A

gas gangrene

Pure Clostridium perfringens infection

Incubation period of hours to days

Local edema and pain accompanied by fever and tachycardia

  1. Pen G (3-4 million U q4h) or
  2. chloramphenicol
  3. Surgical removal of infected muscle
  4. Hyperbaric chamber
57
Q

What is Pyomyositis?

What bug most often causes it?

Treatment? 2

A

A purulent bacterial infection of the skeletal muscles which results in a pus-filled abscess

Staph aureus

Must be drained surgically and antibiotics are given for a minimum of 3 weeks

58
Q

Staphylococcal toxin disorders?

4

A
  1. Gastroenteritis (Food Poisoning)
  2. Toxic Shock Syndrome
  3. (TEN) Toxic Epidermal Necrolysis
  4. (SSSS) Staph Scalded Skin Syndrome
59
Q

Describe the progression to (TEN) Toxic Epidermal Necrolysis?
4

What should we treat with if we even suspect this?

A
  1. first- multiform erythematous minor. little bullseye region.
  2. Its major when you get mucosal membrane involvement. treat different. (oral lesions)
  3. next step is stevens johnsons/blistering
  4. TEN is massive loss of dermis

Prednisone

60
Q

What is a disease caused by epidermolytic toxins produced by certain strains of Staphylococci. This toxin is distributed systemically and results in dissolution of keratinocyte attachments in only the upper layer of the epidermis (stratum granulosum).?

What population does this mostly affect?

A

Staphylococcal scalded skin syndrome

SSSS usually affects newborns and children. Adults are less commonly affected because improved renal function allows for clearance of the toxins from the body, although adults with renal failure are more susceptible

61
Q

What bug are we most worried about for Nosocomial infections: device/ implant associated infections - shunts, catheters, artificial heart valves / joints, pacemaker?

A

Staphylococcus epidermidis

62
Q

How are Streptococcal Infections subdivided and what are the divisions?
3

A

Subdivided by ability to lyse RBC’s

  1. beta hemolysis-complete lysis
  2. alpha hemolysis-partial lysis
  3. gamma hemolysis-no hemolysis
63
Q

What three complications can arise from strep throat?

3

A
  1. post streptococcal glomerulonephritis
  2. Rheumatic heart disease
  3. Scarlet fever
64
Q

How will strep manifest in kids under 4 compared to older kids?

A

a lot of kids carry it in their sinuses and ears. so if little brother 3-4 gets sick from sister who has strep throat age 6. They will present different

65
Q

What is Erysipelas?

What causes it?

A

Acute streptococcus infection of the upper dermis and superficial lymphatics

Streptococcus pyogenes (Beta hemolytic group A Strep)

66
Q

How do we differentiate Cellulitis and Erysipelas?

2 differences

A

Cellulitis has an ill-defined border that merge smoothly with adjacent skin; usually pinkish to reddish

Erysipelas has an elevated and sharply demarcated border with a fiery-red appearance

67
Q

Management of Cellulitis & Erysipelas:
Local Care?3

Long term care?
2 meds for how long

A
  1. Immobilization
  2. Elevation to reduce swelling
  3. Draw lines (with the patients permission)

Two weeks of antibiotic therapy
Penicillin and Dicloxacillin for most patients

68
Q

Superficial lesions that break and form highly contagious crust; often occurs in epidemics in school children; also associated with insect bites, poor hygiene, and crowded living conditions

A

Impetigo (pyoderma)

Honey crust

69
Q

What is a pathogen enters through a break in the skin and eventually spreads to the dermis and subcutaneous tissues; can remain superficial or become systemic. Mostly in the face?

A

Erysipelas

Sharper and red

70
Q

What are the two kinds of Impetigo?

A

Non-bullous and Bullous

71
Q

Whats the cause of Non-bollous impetigo?

What age does it primarily present in?

How does it look?

What is its duration like?

A
  1. Strep Group A or Staph aureus
  2. Preschool and school aged kids
  3. Very thin walled vescile on an erythematous base. Yellowish thick custs
  4. transient
72
Q

What is the cause of bullous impetigo?

What age does it primarily present in?

How does it look?

What is its duration like?

A
  1. Staph aureus
  2. All ages
  3. Bullae of 1-2 cm. Thin flat brownish crusts
  4. persist for 2-3 days
73
Q

Predisposing factors for impetigo?

3

A

Malnutrition
Diabetes
Immuno-compromised status

74
Q

Complications that can occur from impetigo?

4

A
  1. Streptococcal infection (pink eye, meningitis, endocarditis)
  2. Scarlet Fever (Scarlatina. Caused by Strep pyogenes (Group A Strep)
    Can get “Strawberry tongue)
  3. Urticaria (Hives. Allergic reaction)
  4. Erythema Multiforme (unknown etiology. Skin condition in the superficial microvasculature of the skin and oral mucous membranes usually follows an infection or drug exposure)
  5. Streptococcal infection
  6. Scarlet Fever
  7. Urticaria
  8. Erythema Multiforme
75
Q

Treatment of Impetigo?

2 treatments
4 drug choices

A
  1. First soak the affected area in warm water or use wet compresses to help remove overlying scabs
  2. Antibiotic Creams or ointments
    - Bactroban (Mupirocin) AAA tid x 5 days
    - Fusidic Acid Cream AAA x 7-12 days
    - Retapamulon ointment bid x 5 days
    - Consider Septra/Bactrim if has history of MRSA
76
Q 
Streptococcus pyogenes  (group A beta hemolytic strep) Common infections?
6
A 
Cutaneous infections
Pharyngitis (sore throat)
Otitis media
Sinusitis
Pneumonia
Streptococcal Toxic Shock Syndrome
77
Q

Complications of GABHS infections

2

A
  1. Rheumatic fever (RF)-

delayed antibody mediated disease (immune disease)

  1. Glomerulonephritis
78
Q

4 signs for pharyngitis and tonsilitis?

A

strep throat-

  1. white exudate(in virus and bacteria)
  2. petechia
  3. strawberrry tongue,
  4. red beefy tonsils

Mono- looks the same

79
Q

Pathogenicity
of Beta Hemolytic group B strep?
2

A

Neonatal meningitis and sepsis

Pneumonia

80
Q

Most common menigitis bugs for adults?

A

H. flu, nessieria meng

81
Q

Streptococcus pneumoniae (pneumococcus)
Gram positive cocci in pairs. What are some common diseases they cause?
4

What is a core measure associated with this infection?

Does Strep Pneumo have the lansfield antigen?

A

Pneumonia
Otitis media
Sinusitis
Meningitis

Prevention: Vaccination (capsular antigens)
IMMUNIZATION (core measure)
Pneumovax

NO

82
Q

What makes strep pneumo so effective against our immune system?

How would we diagnose pneumonia causes by strep pneumo?
4 symtpoms

What would we hear during auscultation?

A

Polysaccarhide capsule
-we think its one of our own

SHAKING CHILL
HIGH FEVER
RUST COLOR sputum, pleuridic chest pain

dullness/dead spot with consolidation

83
Q

Why do kids have so many ear iinfections?

A

esuatachian tube disfuntion. angle is really poor for good drainage so you get them in chidlren

84
Q

OTITIS MEDIA defintiion?

How is acute otitis media different from otitis media with effusion?

What would otitis with effusion respond best to?

If a child is not talking by two what do we need to ask about in the history?

Most common bug for ear infections?

A

Presence of a middle ear infection

Acute Otitis Media
Bulging TM thats taught with pressure, Erythmatous, might see Pus

Otitis Media with Effusion: Presence of nonpurulent fluid within the middle ear cavity

drainage (may want to treat with an antibiotic but dont need to)

Are they have lots of ear infections? Might be permanent damage to the ear

Strep pneumo

85
Q

Major risk factors for acute otitis media are what?

7

A 
Young age
Bottle feeding
Drinking a bottle in bed
Parental history
Sibling history
Second hand smoke
Daycare
86
Q

Organisms responsible for otitis media are?

7

A
  1. Streptococcus pneumoniae
  2. Haemophilus influenzae
  3. Moraxella catarrhalis
  4. Group A Streptococcus
  5. Staph aureus
  6. Pseudomonas aeruginosa
  7. RSV assoc. with Acute Otitis Media
87
Q

Physical Exam findings for otitis media?

A

The classic description for Otitis Media is an erythematic, opaque, bulging tympanic membrane with loss of anatomic landmarks including a dull/absent light reflex

88
Q

Treatment options for OM?

Infants younger than 6 months?

Children 6 mo to 2 years? 2

Children 2 years and older?

A
  1. Infants younger than 6 months should receive antibiotics
  2. Children 6 months to 2 years should receive antibiotics if the diagnosis is certain (acute onset, MEE, and middle ear inflammation)
    - –Diagnosis uncertain: Observation period 48 to 72 hours with analgesics and follow up
  3. Children 2 years and older should receive antibiotics if diagnosis is certain or illness severe (severe otolagia and temp > 102)
    Observation period an option
89
Q

First line treatment for OM?
3

Allergic or second line?

A

Amoxicillin: 20-40 mg/kg/day TID for 10-14 days or
Augmentin: 45 mg/kg/day BID for 10-14 days
Auralgan: analgesic/adjunct for ear pain 2-4 drops TID

Cefzil, Pediazole, Bactrim

90
Q 
Streptococci viridans (alpha or gamma hemolytic)
is common where?

What are the infections that it causes?
3

A

Common oral/pharyngeal flora

Infections

  • Endocarditis
  • Bacteremia & Septic Shock
  • Dental
91
Q

Group D streptococci (enterococcus)
most common infections that it causes?
5

A
  1. UTI
  2. Endocarditis
  3. Intraabdominal infections (abscesses)
  4. Biliary tract Infections!!
  5. Wound infections
92
Q

Diagnosis of Streptococcal Infections?

4

A

Culture
ASO titers/Streptozyme
Rapid Group A Strep tests
Gram Stains

93
Q

Antistreptolysin O (ASO) titer is a blood test to measure what?

A

antibodies against streptolysin O, a substance produced by group A Streptococcus bacteria

94
Q

S. pyogenes: DOC?

A

PCN (low incidence of resistant organisms)

95
Q

S. pneumoniae DOC?

Entercoccus DOC?

A

increased PCN resistance

Erythromycin for both in PCN allergic patient

Ampicillin for enterococcus

96
Q

What is a Gram positive, nonmotile, spore forming bacterium Bacillus anthracis.

Natural transmission to humans by contact with what?

What makes it so good against our defenses?
2

A

Anthrax

infected animals or contaminated animal products

  1. has special capsule that makes it really good at avoiding phagocytosis
  2. spore is ideal for inhalation
97
Q

How can anthrax be transmitted?

3

A

Contact, ingestion, or inhalation of infective spores

98
Q

Incubation period of anthrax?

Clinical syndromes? 4

Main threat for anthrax?

How does it manifest?

A

1-7 days (1-60 days)

Cutaneous ulcer,
respiratory,
gastrointestinal, oropharyngeal

Inhalation

Bronchopneumonia not a component (hemorrhagic lymphadenitis and mediastinitis) - so you dont see it coming until symptoms are really bad

99
Q

What are the two biggest causes of death for anthrax?

Most comomn?

A
  1. lyphatic or hematogenous spread leading to menigitis (most common)
  2. Pulmonary lymphatic bloackage leading to pulmonary edema
100
Q

Epidemiology of inhalation anthrax?

A

Sudden appearance of multiple cases of severe flu illness with fulminant course and high mortality

101
Q

Clinical symtpoms of inhalation anthrax?3

Serious symptoms?
4

A
  1. Non-specific prodrome of flu-like symptoms
  2. Possible brief interim improvement
  3. Abrupt onset of
  • respiratory failure and
  • hemodynamic collapse 2-4

days after initial symptoms, possibly accompanied by

  • thoracic edema and a
  • widened mediastinum on CxR
102
Q

INHALATION ANTHRAX: DIAGNOstic studies?

2

A
  1. Chest radiograph with widened mediastinum

2. Peripheral blood smear with gram (+) bacilli on unspun smear

103
Q

Microbiology for anthrax diagnosis?

A

Blood culture growth of large gram (+) bacilli with preliminary identification of Bacillus spp.

104
Q

Pathology of diagnosis for anthrax?

4

A
  1. Hemorrhagic mediastinitis, 2. hemorrhagic thoracic
  2. lymphadenitis,
  3. hemorrhagic meningitis
105
Q

Prophylaxis treatment for anthrax?

Preexposure?
Postexposure?2

A

Pre-exposure: Vaccine
{not currently available}

Post-exposure: Ciprofloxacin (or other quinolone) or doxycycline (vaccine if available)

106
Q

Treatment for cutaneous anthrax?

A

Ciprofloxacin or doxycycline x 60 days

107
Q

Treatment of anthrax for inhalation?

3 things to remember

A

Ciprofloxacin or doxycline PLUS
1 or 2 other drugs (e.g., vancomycin, imipenem)
Initial Rx should be IV then switch to PO for total 60 days

108
Q

Diphtheria infects what part of the body?

What are its most common complications?
2

A

mucous membrane

Most common complications are myocarditis and neuritis

109
Q

Symtpoms of Diptheria?

4

A

sore throat,
malaise,
cervical lymphadenopathy
low grade fever.

110
Q

Whats the earliest pharyngeal finding in diptheria?

A

pharyngeal finding is mild erythema, which can progress to isolated spots of gray and white exudate.

111
Q

Treatmen of diptheria? 2

For severe cases?

How should we monitor?
3

How do we grow out and culture diptheria?

A

Antibiotics- erythromycin or penicillin G

diphtheria antitoxin for severe cases.

  1. Careful airway management
  2. serial electrocardiograms and cardiac enzymes
  3. Neurologic status should also be monitored carefully

potassium tellurite

112
Q

skin infections and abcesses. go to bacteria?

How do we treat staph?

Which streps have the lancefiled anitgen?

If pregnant mom has group B strep what should we treat with?

A

Staph auerus

sulfa then doxy then vance

Group ABD

36 weeks treat with IV antibiotics. (amoxicillin and pen G)

113
Q

Strep pneumo treat with what?

3

A

amox, aug, pen g

Infectious Disease (29 decks)

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