Microbiology (Joe) Flashcards
Microbiology (Joe)
Neisseriaceae
Gram ( - ) Cocci
Genus: Neisseria
coffee bean shaped
Vibrianaceae
Gram ( - ) Bacilli
Genus: Vibrio
Campylobacter
Gram ( - ) Bacilli
mcc of diarrhea
Pseudomonas
Gram ( - ) Bacilli
blue/green pus
warm, moist places
mc pneumonia with cystic fibrosis patients
Haemophilus
Gram ( - ) Bacilli
Francisella
Gram ( - ) Bacilli
Rabbit Fever
bugs bunny is french
Legionella
Gram ( - ) Bacilli
water droplets
Legionaire’s Disease
(minor form of Legionaire’s = pontiac)
Spirochaetales
Treponema (syphillis)
Borrelia (Lyme disease)
Leptospira (Weil’s Disease/ hemorrhagic jaundice)
Mycoplasmataceae
Mycoplasma
Atypical pneumonia
- lacks cell wall
- penicillin is ineffective
- penicillin inhibits peptidoglycan → stops cell wall synthesis → no cell wall present
Chlamydia Trachomates
Reiter’s Disease
track mates write
Chlamydophila psittaci
Parrot Fever
“the parrot sits low on the shoulder”
Rickettsiaceae Coxiella
Coxiella Burnetii causes Q fever - spread via milk
rickettsia rickettsii - spread by insects
Hepadnaviridae
Hepatitis B Virus
DNA Virus
Paramyxoviridae
Measles virus, mumps virus
Coronaviridae
Corona virus
Causes SARS - China Epidemic in 2002
sorry about coronas in china
Rhabdoviridae
Rabies virus
- bullet-shaped virus*
- hydrophobia
*hunt rabid animals with a bullet
Filoviridae
Ebola virus
- 5 types, 4 will cause hemorragic diarrhea
filo fourfive
Reoviridae
Rotavirus
mcc of infantile diarrhea
Togaviridae
Rubella virus
German measles
german toga party
Calciviridae
Norwalk virus - causes gastroenteritis
associate w cruise ships
calnival cruises
IgA Antibody
secretory (mucosal) antibody
mucous membrane (saliva, tears)
breast milk
IgD Antibody
Helps IgG
IgE Antibody
Parasitic infections
Allergic reactions
increases in Hodgkin’s
- puritis (intense itching)
- Dx: biopsy for Reed Sternberg cells
IgG Antibody
First to increase (upon second exposure)
Most numerous
Crosses placenta (“Gee Ma, thanks”)
Anamnestic response - without amnesia = body remembers for next time
IgM Antibody
Pentameter - 10 binding sitesLargest and heaviestFirst to increase (first exposure)
largest
m = muscle
Interleukin I
Made by macrophages
activates lymphocytes
Interleukin II
Made by CD4 = T cell = QB of immune system
Interleukin III
Made by bone marrow
MHC/ Major Histocompatability Complex
self vs non-selfgraft and organ rejection
T-cells recognize MHC I
B-cells recognize MHC I and II
Diseases by Staph Aureus
(5: “STOIC”)
“STOIC” = S (scalded skin syndrome), T (toxic shock), O (OSTEOMYELITIS*), I (impetigo*→ honey crusted lesion around mouth), C (carbuncles: many infected hair follicles/furuncles “a carload of furuncles”)
-
MRSA: methicillin-resistant staph aureus
- organism seen in athletic locker rooms
- Vancomyosin = only effective antibiotic
Diseases by Strep Pyogenes
(6: “SERGIS”)
group A, beta-hemolytic strep
“SERGIS” = S (strep throat), E (erysipelas), *R (rheumatic fever), G (glomerulonephritis), I (impetigo - #2 cause), S (scarlet fever = strawberry tongue)
-
Rheumatic Fever:
- mnemonic: “Can Sammy Suck Ethyl’s Polyp’s?”
-
C = carditis
- MacCallum Patch in posterior left atrium
-
S = Syndenham’s Chorea*
- strep-related chorea affecting kids
- S = subcutaneous nodule
- E = erythemia marginatum
- P = migratory polyarthritis
-
C = carditis
- mnemonic: “Can Sammy Suck Ethyl’s Polyp’s?”
- Nephritic Syndrome
-
Vegetation on mitral valve
- Aschkoff Bodies
Rheumatic fever
strep pyogenes - group A beta hemolytic strep
carditis (MacCullum patch in post left atrium), sydenhams chorea, subcutaneous nodule, erythema marginatum, migratory polyarthritis
Complement System
(Purpose and Pathways)
Purpose: enhance phagocytosis/cellular lysis
Pathways:
- Classical (Ag-Ab)
- Alternate (Sheep RBC’s?)
- Both pathways meet at C3B
-
C5b-C9 = MAC (Membrane Attack Complex)
- C9 → “terminal complement”
Inclusion Bodies
Bodies present in nucleus or cytoplasm of certain cells in infection by filterable viruses
Inclusion Bodies:
Aschoff Bodies
Rheumatic Fever
extensive = MacCallum’s Patch
Inclusion Bodies
Babes Ernst Granules
Metachromatic granules seen in diptheria
(pseudomembrane in throat)
Inclusion bodies
Downey Cell
mononucleosis → “don’t let mono get you down”
atypical lymphocytes
Inclusion Bodies
Epithelioid Histiocyte
TB
Giant epithelial cells
Inclusion Bodies:
Gohn Complex
TB (inactive phase)
Inclusion Bodies:
Guarneri Bodies
Small pox (variola)
- “eradicated in 1977 from vaccines”
Inclusion Bodies
Gummas
tertiary syphillis
Inclusion Bodies:
Koplik Spots
Measles
on buccal mucosa
white/bluish spots
Inclusion Bodies:
*Lipofuscin
“old age pigment”
buildup of lipofuscin in organs = *Brown’s atrophy
Inclusion Bodies:
Lewy Bodies
Parkinson’s (AKA pa**ralysis agitans)
Inclusion Bodies:
*Mallory Bodies
Hepatitis (alcoholism)
Inclusion Bodies:
Negri Bodies
Rabies (hydrophobia)
Inclusion Bodies:
*Reed Sternberg
Hodgkin’s
Inclusion Bodies:
*Russell Bodies
found in plasma cells, consists of antibodies
- from chronic inflammation and malignant disorders
associated with multiple myeloma
Inclusion Bodies:
Plummer Vincent
esophageal webbing
Active vs Passive Immunity
Active = must actively make own antibodies (Ab)
Passive = given antibodies (Ab), received from outside→in
Natural Active Immunity
exposure to disesase → body reacts
ex) measles, chicken pox triggers antibody production
Artificial Active Immunity
injection of attenuated organism
ex) tetanus toxoid = inactivated protion triggers immune system to make antibody
Natural Passive Immunity
Given antibodies…
- in utero: IgG (“gee thanks, ma”)
- breastfeeding: IgA
Artificial Passive Immunity
injection of preformed antibodies
- ex) tetanus antitoxin = premade antibody, attacks circulating toxins, not bound toxins*
- Tetanus antitoxin cannot cross blood-brain barrier
Endotoxin
toxin from lipopolysaccharide layer of the cell
Exotoxin
Toxin from outside cell from waste products
Heat labile
(ex: staph)
Fomite
vector is inanimate object
Hapten
partial antigen/half antigen
does not stimulate immune response
(must combine with protein to be toxic)
Neurotoxin
affects nervous system
Botulism, tetanus
Opsonin
enhance phagocytosis by marking target for strike
Prion
cannot be autoclaved/sterilized
Type I Hypersensitivity
- anaphylactic (immediate, acute)
- allergy
- IgE, mast cells, basophils
Type II Hypersensitivity
- cytotoxic
-
Goodpasteur’s
- (lung and kidney)
- “You go outside in the Good-pasture, take a deep breath, then you have to pee”
- caused by group A beta-hemolytic strep
- (lung and kidney)
-
Erythroblastosis Fetalis
- Rh(+) baby, Rh(-) mother
- Mothers worry, have negative thoughts
- blood transfusions
-
Myasthenia Gravis
- weakness and rapid fatigue of muscles under voluntary control
- IgG targets cell for phagocytosis
-
Type II = 2 things
- antigen + antibody
Type III Hypersensitivity
- immune-complex mediated
- Glomerulonephritis, lupus, RA
- Arthus rxn = local necrosis
- Serum Sickness = systemic
Type IV Hypersensitivity
- Delayed
- Cell-mediated (only one NOT antibody-mediated)
- TB, contact dermatitis (poison ivy, poison oak, etc.)
- Transplant rejection via MHC
Autotroph
eats inorganic material
Heterotroph
eats organic material
Saprophyte
eats dead/decaying material (organic)
Parasite
eats off living organisms
Zoonosis
transfer of disease from animal to human
ex) Anthrax
- woolsorter’s disease”
- Gram ( + ) rod
- sporulates
Microaerophilic
Lives in areas of reduced O2
high-altitude plants
grown in Candle Jar culture
Flagella Arrangement
Monotrichus = single flagella, one pole
Lophotrichus = multiple flagella on one pole (tuft at end)
Amphitrichus = “both” flagella, both poles
Peritrichus = “around”, flagella everywhere
Lab Tests:
Ames Test
Salmonella typhimurium
Lab Tests:
ASO Titer
Antistreptolysin O Titre
Strep pyogenes test
Rheumatic Fever
Lab Tests:
BOD
Biological Oxygen Demand
best test for water pollution
Lab Tests:
Catalase
Staph vs. Strep
(cat + ) (cat - )
Lab Tests:
Chick Embryo Culture
virus culture
Lab Tests:
Chocolate Agar*
AKA Thayer Martin Agar
AKA Heated Blood Agar
for Gonorrhea
Lab Tests:
Coagulase
- *Staph Aureus** vs other Staph
- (pathogenic vs non-pathogenic staph)*
Lab Tests:
Coombs
Erythroblastosis Fetalis (TII hypersensitivity)
Lab Tests:
Dick Test
Scarlet Fever
Lab Tests:
HLA B27
Seronegative arthridities
(PEAR = psoriatic, enteropathic arthorpathy, AS, Reiter’s)
Lab Tests:
Giemsa Stain
protozoa
Lab Tests:
HLA DR5/CD4
AIDS
ELISA test checks DNA
Western Blot checks proteins
If 2 ELISA (+), do WB. If WB (+) = AIDS Dx
Lab Tests:
Mannitol Salt
Staph
Lab Tests:
Nuchal Rigidity
Meningitis
(low glucose)
Lab Tests:
Paul Bunnel
Heterophile Agglutination test for mononucleosis
Mononucleosis
- heterophile antibody = Ab seen in microscopy
- heterophile agglutination = Paul Bunnel
- Downey cell = atypical lymphocyte
Lab Tests:
Quellung Reaction
Strep Pneumoniae
(mcc of meningitis)
“quellung is swelling”
(**of strep capsule)
Lab Tests:
Sabouraud Agar
fungi
Lab Tests:
Tissue culture
virus culture
Lab Tests:
*Weil Felix
Positive for all Rickettsia except Coxiella Burnetii (Q fever)
Lab Tests:
*Widal
Typhoid Fever
Lab Tests:
*Tzank Test
Herpes Zoster
Syphilis Testing
(Treponema, spirochete)
Wasserman
VDRL = Venereal Disease Research Lab
Darkfield
Tuberculosis Testing
- BEST TB TEST = Sputum Culture (shows active)
- Tine Test = skin prick
- PPD/Mantoux Test = purified protein derivative
- Delayed Hypersensitivity Test
-
Ziehl Nielson Staining
- acid fast organisms
- “my ass is fast” = _my_cobacterium _ac_id fast
- Chest x-ray = Gohn Complex in Lung
- BCG vaccine = uses mycobacterium bovis
Pasteurization Methods:
Sterilization/Autoclave
steam heat under pressure, denatures membranes
274°F, 15 mins
ineffective against prions
Vaccinations
Inactivated
SALK = poli vaccine
rabies
Vaccinations
Live Attenuated
measles, mumps, rubella
Sabin = oral
Studies
Case Control: IDs risk factors
Double Blind: eliminates placebo
Retrospective/Cohort: go back in time
Blue/Green pus
Pseudomonas Aeruginosa
- open burn infection, unsanitized hot tub, contact lenses
- hot, warm places
- flouresces blue under UV light, procyanin
- #1 cause of pneumonia in Cystic Fibrosis patients
Red Pus
Serratia marcenscens
White Pus
Chlamydia
Yellow/gold pus
staph aureus
Au = gold
Yellow/green pus
Gonorrhea
Acid Fast Stain
Mycobacterium
“My ass is fast”
Blood Agar Stain
Alpha Hemolysis
Alpha = partial (green ring)
-
strep pneumoniae
- mcc meningitis
-
strep viridans
-
SBE/ subacute bacterial endocarditis
- splinter hemorrhages under fingernails
- must have Rheumatic Fever first
-
SBE/ subacute bacterial endocarditis
Blood Agar Stain
Gamma Hemolysis
gamma = none, red ring
Strep Mutans
- cavities/ “dental caries”
Giemsa Stain
Protozoa
Gram Stain Procedure
Primary = crystal violet or methylene blue
- (Gram + stains purple/blue)
Fixer = Iodine, “mordant”
Decolorizer = alcohol wash
Counterstain = saffarin
Drugs:
Iodine
pre-op disinfectant
Drugs:
MRSA
Methycilline-Resistant Staph Aureus
Hospitals use Vancomycin now
Drugs:
Penicillin
inhibits cell wall synthesis
(glycoproteins)
Drugs:
Sulfa
competes with PABA
(Para-aminobenzoic acid)
Drugs:
Tetracycline
for gram negative and positive (broad spectrum)
inhibits protein synthesis
turns teeth gray or yellow brown
Famous People:
Ehrlich
Sulfa drugs
First treatment for Syphilis
Famous People:
Flemming
Discovered Penicillin (1928)
Famous People:
Koch
“proved bacteria causes disease”
Koch’s 4 postulates
Anthrax Vaccine
Famous People:
Lister
Antiseptis
sterilization of surgical instruments
Famous People:
Pasteur
Father of Pathology
Father of GErm Theory
Rabies vaccine
Famous People:
Walter Reed
Yellow Fever
(spread by ades egypti mosquito)
Famous People:
Sabin
Live Polio vaccine
given orally
Famous People:
Salk
Dead Polio vaccine
given by injection, before Sabin
Famous People:
Semmelweiss
handwashing before delivering a baby
reduced Puerperal Fever (aka Childbed Fever)
Colony Variation
Description of morphology upon examination of an agar plate:
**R = rough S = smooth**
D = dwarf H = spreading M = mucoid capsule forming: related to virulence O = compact (O vs H)
Koch’s Postulates
- Find microorganism in patients
- Isolate and grow
- Observe: should cause disease in healthy individual
- Reisolate microorganism from inoculated people
Cell Sex Life
- *Conjugation***
- *plasmid DNA,** transfer via sex pilus (little penis!)
Transduction
transfer of genetic material from between bacteria
bacteriophage: altered virus
Transformation*
direct uptake of free DNA
Governmental Agencies:
CDC
Center for Disease Control
Statistics, NOT RESEARCH
(compiles morbidity and epidemiological statistics)
Branch of US Navy
Part of US Health Services
Governmental Agencies:
EPA
Environmental Protection Agency
monitors quality of soil, air and water
Governmental Agencies:
FDA
Food and Drug Administration
regulates health products released to public
Monsanto(?)
(regulates product misrepresentation, promotion, advertising)
Governmental Agencies:
NIH
National Institute of Health
research, not statistics
Located in Bethesda, Maryland
Governmental Agencies:
OSHA
Occupational Safety and Health Administration
makes rules regarding occupational toxicity levels of hazardous materials
powerful agency
“Emerging”
new disease or rapid increase in incidence or in geographic range
Ex) AIDS, Ebola… in USA: TB, MRSA, H1N1/Swine Flu
“Endemic”
small number of cases in specific location
present all the time
“Incidence”*
number of NEW cases in a given time period
ex) how many new cases last year?
“Pandemic”
more than expected # of cases of a disease worldwide
“Prevalence”*
total # of cases at a particular point in time
ex) total cases right now
Leading Causes of Death
(infants, adults/US, adults/worldwide)
Infants
- *1. Congenital malformations
2. Prematurity**
Adults (United States)
- *1. Heart Disease
2. Cancer
3. Stroke**
4. Respiratory infection
5. Accidents
Adults (Worldwide)
- *1. Tuberculosis**
2. Malaria
Water Purification Process
Primary (Sewage) Treatment
filtration → flocculation → sedimentation → sludge digestion
Secondary Treatment
sand filtration → aeration*→ chlorination → possible fluoridation
*aeration decreases BOD/ biological oxygen demand
Helminth Types
“_T_ry _R_onnie _F_irst”
_T_apeworm / _R_oundworm / _F_luke
_C_estodes / _N_ematodes / _T_rematodes
(alphabetical order match)
Tapeworms: “Cestodes”
- long, ribbon-like body
- Head = “scolex” (attaches to intestine)
- Body = proglottids
Roundworms: “Nematodes”
- cylindrical, unsegmented
- Spongebob
Flukes: “Trematodes”
- flat, ovoid body
Tapeworms/Cestodes
Hymenolepis Nana
Dwarf tapeworm
Bethanie says her Nana is a dwarf
Tapeworms/Cestodes
Diphyllobothrium latum
Fish tapeworm
may cause B12 deficiency
Pacific NW Salmon
Channing Latum looks like a fish? Idfk
Flukes/Trematodes
Shistosoma Japonicum
Blood
Host = snail
S/Sx:
- Swimmer’s itch
- mcc of death by a helminth (parasitic worm)
Flukes/Trematodes
Paragonimus Westermani
Pulmonary (lung)
Crayfish
Roundworms/Nematodes
Ascaris lumbricoides
most common roundworm
most common helminthic infection worldwide
Roundworm: “my ass is round”
Roundworms/Nematodes
Wuchereria Bancrofti
(Filiariasis)
mosquitoes
S/Sx:
- Elephantitis
- lymphatic Blockage
Rondworms/Nematodes
Necator Americanus
(Hookworm)
Fecal-contaminated soil
wear shoes to prevent
mc hookworm in US
Roundworms/Nematodes
Enterobius vermicularis
(Pinworm/threadworm)
anus-finger-mouth
Scotch-Tape Test/ Anal Cellophane Test
mc helminth in the US
Roundworm/Nematode
Onchocerca volvulus
(River blindness)
African flies
Roundworm/Nematodes
Loa loa
(River eye worm)
Flies
“African Eyeworm”
Roundworm/Nematodes
Trichonella spiralis
(Trichinosis)
raw pork
lives in striated muscles
Dx on xray, mm biopsy to confirm
Roundworms/Nematodes
Trichuris trichura
(whipworm)
“whip those T’s together”
oral-fecal
weight loss
Virus Transmission
Most commonly transmitted or acquired via the respiratory system.
Exceptions:
-
*Arboviruses = mosquitoes
- encephalitis, yellow fever, dengue
- Polio = oral/fecal
-
*Hepatitis
- HepA: oral/fecal
- HepB: sexual transmission, IV drugs
- HepC: transfusions, tattoos
Herpes Simplex
(two types)
Viral Diseases and Skin Reactions
Type 1
- fever blisters (cold sores) - “above the belt”
- Trigeminal/ “Gasserion” ganglion
Type 2
- Genital Herpes - “below the belt”
Herpes Zoster
viral disease with skin reaction
- Shingles in adults
- does not cross midline
- hides in DRG
- follows dermatome
- stress-induced
Molloscum contagiosum
viral disease with skin reaction
pink cauliflower lesion on female genitalia
Rubella
Viral disease with skin reaction
German Measles “3-day measles”
most susceptible in 1st trimester
Rubeola
viral disease with skin reaction
Red Measles (“Ruby Red”)
Koplik spots on buccal mucosa
- white/blue spots
Varicella (chicken pox)
viral disease with skin reaction
maculopapularvesicular rash = red, elevated fluid-filled lesions
Variola
viral disease with skin reaction
Small Pox*
guarneri bodies
(*eradicated in 1977 via vaccine)
Coxsackie Virus B
viral disease with enteric reaction
childhood dysentery
(hand, foot and mouth disease)
Adenovirus
viral disease with respiratory reaction
conjunctivitis, pharyngitis
Influenza Virus
antigenic shift and/or drift
- small mutation = drift
- big mutation = shift
causes the flu no fuckin shit
Mumps
- viral disease w respiratory reaction
- caused by sidomegalic paramyxoid virus
- causes parotiditis
- leads to LMN disease of CN7 (Bells Palsy)
- Complications
- sterility from oophritis or orchitis
RSV
Respiratory Syncytial Virus
causes croup and bronchiolitis
Rabies
- bullet-shaped
- RNA, rhabdovirus
- negri bodies in brain
- hydrophobia
Reyes Syndrome
fatty liver (hepatomegaly)
encephalopathy
AIDS
- caused by retrovirus (HIV)
- reverse transcriptase (RNA → DNA)
-
CD4 cells affected
- T-helper cells
- Complications
- pneumocystis carinii
- toxoplasmosis
- Kaposi sarcoma
- Giardia Lamblia
AIDS Complications
Pneumocystis carinii
#1 fungal infection in AIDS
#1 cause of death in AIDS (from pneumonia)
AIDS Complications
Toxoplasmosis
1 parasitic infection in AIDS
spread by cat feces → birth defects
AIDS Complications
Kaposi Sarcoma
1 cause of death by cancer in AIDS
Hepatitis A
- fecal/oral
- NOT a carrier for life *ONLY ONE
- no sequelae (B,C,D = liver cancer)
- RNA virus
- “get it and get over it”
Hepatitis B
- sexual transmission, IV drugs
- carrier for life
- sequelae: liver cancer (also true for: Hep’s B/C/D)
- DNA ONLY* (only one DNA, A/C/D = RNA)
- most lethal in acute phase
- Endemic in asian cultures
Hepatitis C
- blood transfusion, tattoos
- carrier for life
- seq: liver cancer
- RNA
- AKA “non-A, non-B hepatitis”
Hepatitis D
- co-infectious with Hep B
- carrier for life
- liver cancer
- RNA
- aka “Dane” particle - only replicates in presence of Hep B
Arboviruses
Group A
causes all equine encephalitis diseases:
Western, Eastern, St. Louis
(Eastern Equine Encephalitis = West Nile Virus)
all spread by mosquitoes
Arboviruses
Group B
Yellow Fever
“yellow” = jaundice
discovered by Walter Reed
ades agypti mosquito
viscerotropic virus (affects liver)
Dengue Fever
vector: mosquito
develop backbone fever or “bone crusher disease”
Yersinia pestis
(Pasteurella pestis)
Bubonic Plague, “black death”
arthropod-borne bacteria
Rat flea = xenopsylla cheopis
Bubos = neck and axillary lymph node enlargement
Francisella Tularensis
Tuleremia
Rabbits
(Rabbit Fever)
Hunters at risk
“The _Fr_ench Rabbits smell _Tul_ips”
Clostridium botulinum
Botulism
- food-borne bacteria
- vector: home-canning
- Prevents ACh release → Floppy Baby Syndrome
- Nitrates added to meat to prevent botulism
1st symptom: diplopia (double-vision)
2nd symptom: death
Campylobacter jejuni
- food-borne bacteria
- mcc gastritis
- # 1 cause of food poisoning
Listeria monocytogenes
- Listeria
- food-borne bacteria
- deli meats and soft cheeses
Salmonella entrides
Salmonella
- eggs and poultry
- 12-24 hours after ingestion
- Fever
Staphylococcus Aureus
Staphylococcus
- food-borne bacteria
- creams and custards
- 2-4 hours after ingestion
- no fever
- stable toxin
Salmonella typhi
Typhoid
- rose-colored spots on abdomen
- Peyer’s patches in ileum
Brucella abortus
Brucellosis
Bang’s Disease = undulant fever
Spontaneous abortions in cattle
Vibrio Cholera
Cholera
- comma-shaped
- rice water stools (massive diarrhea)
- no lymph enlargement
Shigella
Shigella
- water and soil borne
- bacterial dysentery (w. blood in stool)
E. coli
(enterotoxigenic form
& enterohemorrhagic form)
-
enterotoxigenic form → Montezuma’s Reveng
- “Traveler’s Diarrhea”
-
enterohemorrhagic form → E. coli OH157
- Hamburger’s Disease
-
fatal
- # 1 cause Otitis Externa
Bacillus anthracis
Anthrax, AKA “Woolsorter’s Disease”
- Gram (+) rod
- sporulates
- Zoonosis (infectious dzs of animals naturally spread to humans)
Clostridium tetani
Tetanus
- trismus (lockjaw)
- inhibits GABA and Glycine (blocks inhibitory neurotransmitter’s)
Clostridium perfingins
AKA Clostridium wlichi
Haemophilus influenza
- *#1 cause of otitis media**
- (middle-ear infection)*
#2 cause = strep pneumoniae
Leptospira interrogans
Leptospira ictohemorrhagica
Weil’s Syndrome
(hemorrhagic jaundice)
Borrelia burgdorferi
Lyme’s Disease
- vector = deer tick (Lxodes scapularis)
- Erythema Chronicum Migricans
- AKA* bullseye rash
Borrelia recurrentis
Relapsing Fever (recurrent)
fever comes and goes (relapsing)
Treponema pallidum
STD: Venereal Syphilis
- Primary = hard, painLESS chancre
- Secondary = maculopapular rash w condylomata lata
- Latency = may/may not show symptoms
-
Tertiary = neurosyphilis, gummas, Argyll Robertson pupil, tabes dorsalis
- (“tabes” = wasting, “dorsalis” = back) posterior columns affected
*Treponema differentiation: Dark Field Microscopy
Treponema pertenue
Non-venereal syphilis
casual contact
*Treponema differentiation: Dark Field Microscopy
Dysentery
Childhood = Coxsackie virus B (hand, foot and mouth dz)
Bacterial = shigella
Amoebic = entamoeba histolytica (infective stage = cyst)
Bacterial Types
Pleomorphic = many shapes (diptheria)
Rabies = bullet-shaped
Vibrio = comma-shaped (curved)
Bacterial Enzymes that add virulence:
Coagulase
Staph
makes thicker
catalyses breakdown of fibrinogen to form fibrin
Temperatures for Bacterial Growth
Psychrophilic: 15°C or lower
- Mesophilic: 20-4*0°C, optimal=37°C (human temp)
- **killed by fevers**
Thermophilic: 45°C or above
mcc Meningitis by age group
Newborns: E. coli (“little shits”)
Infants/older children: strep pneumoniae
Adults: strep pneumoniae
*Most lethal meningitis = Naegleria Fowleri
causes 1° amoebic meningoencephalitis
Entamoeba histolytica
(trophozoite and cyst)
Amebiasis
infective form = cyst
Protozoal infection (Giemsa stain)
Leishmania donovani
Kala-Azar (Leishmaniasis)
sandflies
viscerotropic
Dehli Boil
Giardia lamblia
(trophozoite and cyst
4 pairs of flagella)
Giardiasis, “beaver fever”
infective form = cyst
hikers, drinking stream water
4 pairs of flagella
Protozoal infection (Giemsa stain)
Plasmodium vivax
Malaria (most common form of malaria)
female anopheles mosquito
Merozoite stage
- propogation through body
- becomes pathogenic at this stage*
Plasmodium Falciparum
Malaria (most fatal form)
anopheles mosquito
Black Water Fever (urinating oxidized blood)
Protozoal Infection (Giemsa Stain)
Toxoplasma gondii
Toxoplasmosis
cat feces
miscarriages if 1st exposure and in first trimester
Protozoal Infection (Giemsa Stain)
Trypanosoma cruzi*
Trypanosomiasis
Kissing “reduviid” bug
Chaga’s Disease
Protozoal Infection (Giemsa Stain)
Trypanosoma gambiense*
Trypanosomiasis
Tsetse fly
African sleeping sickness
neurological problems affecting the brain
Protozoal Infection (Giemsa Stain)
Virulence Factors of Fungi
Keratinase = attacks skin
Proteinase = attacks muscle
Elastase = attacks connective tissue
Aspergillus fumigatus*
Fungal infection
Aspergillosis
nuts and grains
fungus ball in lungs
Endemic fungus
Histoplasmosis
Mississippi/Ohio Valley Fevers
Calcific lesions in lung, similar to TB
Pneumocystis carinii
- *AIDS Pneumonia**
vector: pigeon droppings (assoc. w/all birds)
#1 fungal infection in AIDS #1 cause of death in AIDS (from pneumonia)
fungal
Sporotherix schenckii
Sporotrichosis
flowers
gardeners at risk
fungal
Cutaneous Mycoses
“ringworm, dermatophytoses”
superficial fungal infection of the skin
Detection:
- Woods Lamp = UV light
-
skin scrapings from periphery of lesion,
- tested in KOH/ potassium hydroxide
- no blood tests
Cutaneous Mycoses
tinea barbae = ringworm of beard
tinea capitis = scalp
tinea corporis = body
tinea cruris = groin, “jock itch”
tinea pedis = foot, “athlete’s foot”
tinea unguinum = nail
Coxiella burnetti*
Rickettsia
Q-fever
milk
- *Weil-Felix (-)***
- *all rickettsia W-F(+) except coxiella burnetti*
Rickettsia prowazeki
Epidemic typhus, aka “Bril-Zinsser’s dz”
head louse
Rickettsia rickettsii
- *Rocky Mountain Spotted Fever**
- “Dermacenter andersoni”*
rash on wrists and ankles
Wood tick