chap 19 Flashcards

1
Q

Cause: Streptococcus pyogenes (Group A Strep)

Transmission: Enters through wounds, spreads rapidly in fascia

Symptoms: Severe pain, swelling, skin discoloration, necrosis, fever

Treatment: IV antibiotics (Penicillin, Clindamycin), surgical debridement
Epidemiology: Rare but deadly, high
mortality if untreated

Diagnosis: Clinical signs, blood tests, imaging, tissue biopsy

A

Necrotizing Fasciitis

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2
Q

Cause: Propionibacterium

Transmission: Overproduction of sebum, clogged pores, bacterial overgrowth

Symptoms: Pimples, blackheads, cysts, inflammation

Treatment: Topical retinoids, benzoyl peroxide, oral
antibiotics (Doxycycline), isotretinoin for severe cases

Epidemiology: Common in teens, hormonal influence

Diagnosis: Clinical presentation

A

Acne

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3
Q

Cause: Bartonella henselae

Transmission: Cat scratches or bites

Symptoms: Swollen lymph nodes, fever, fatigue, red papule at scratch site

Treatment: Self-limiting; Azithromycin for severe cases

Epidemiology: More common in children, worldwide

Diagnosis: Serology, PCR,

A

Cat Scratch Disease

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4
Q

Cause: Pseudomonas aeruginosa

Transmission: Contaminated water, wounds, hospital settings

Symptoms: Greenish-blue pus, fever, sepsis, pneumonia in immunocompromised

Treatment: Antibiotics (Piperacillin-tazobactam, Ceftazidime), resistant strains require combination therapy

Epidemiology: Nosocomial infection, common in burns & cystic fibrosis

Diagnosis: Culture, Gram stain

A

Pseudomonas Infection

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4
Q

Cause: Rickettsia rickettsii

Transmission: Tick bites (Dermacentor spp.)

Symptoms: Fever, headache, rash (starts on wrists/ankles, spreads centrally)

Treatment: Doxycycline

Epidemiology: Southeastern & South-Central U.S., high fatality if untreated

Diagnosis: Serology, PCR, clinical suspicion

A

Rocky Mountain Spotted Fever

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5
Q

Cause: Bacillus anthracis (spore-forming bacterium)

Transmission: Contact with contaminated animal products

Symptoms: Painless black eschar, fever, lymphadenopathy

Treatment: Ciprofloxacin or Doxycycline

Epidemiology: More common in agricultural workers

Diagnosis: Culture, PCR, serology

A

Cutaneous Anthrax

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6
Q

Cause: Clostridium perfringens
Transmission: Deep wounds contaminated with spores
Symptoms: Severe pain, crepitus, foul-smelling discharge, necrosis
Treatment: IV Penicillin, Clindamycin, hyperbaric oxygen therapy, debridement
Epidemiology: More common in trauma and war injuries
Diagnosis: Gram stain, imaging (gas in tissues)

A

Gas Gangrene

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7
Q

Cause: Herpes Simplex Virus (HSV-1, HSV-2)

Transmission: Direct contact, sexual, vertical (mother to child)

Symptoms: Painful vesicles, fever, recurrence common

Treatment: Acyclovir, Valacyclovir

Epidemiology: Worldwide, lifelong infection

Diagnosis: PCR, Tzanck smear

Cause: Herpes Simplex Virus (HSV-1, HSV-2)

Transmission: Direct contact, sexual, vertical (mother to child)

Symptoms: Painful vesicles, fever, recurrence common
Treatment: Acyclovir, Valacyclovir

Epidemiology: Worldwide, lifelong infection

Diagnosis: PCR, Tzanck smear

A

Herpes Infection

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8
Q

Cause: Human Papillomavirus (HPV)

Transmission: Direct contact, fomites

Symptoms: Skin growths, common on hands & feet

Treatment: Cryotherapy, salicylic acid, laser therapy

Epidemiology: Common in children, sexually transmitted types (HPV 6,11) cause genital warts

Diagnosis: Clinical appearance, biopsy if uncertain

A

Warts

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9
Q

Cause: Variola virus (Smallpox), Monkeypox, Molluscum contagiosum

Transmission: Respiratory droplets, direct contact

Symptoms: Fever, pustular rash, scarring

Treatment: Supportive, smallpox vaccine available

Epidemiology: Smallpox eradicated, Monkeypox emerging

Diagnosis: PCR, serology

A

Diseases of Pox Viruses

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10
Q

Transmission: Respiratory droplets, transplacental

Symptoms: Mild rash, fever, lymphadenopathy; congenital
rubella causes birth defects

Treatment: Supportive, MMR vaccine prevents

Epidemiology: Rare in vaccinated populations

Diagnosis: Serology (IgM, IgG)

A

Rubella (German Measles)

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11
Q

Transmission: Airborne droplets

Symptoms: High fever, cough, conjunctivitis, Koplik spots, maculopapular rash

Treatment: Supportive, Vitamin A for severe cases, MMR vaccine prevents

Epidemiology: Highly contagious, outbreaks in unvaccinated groups

Diagnosis: Serology, PCR

A

Measles (Rubeola)

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12
Q

Cause: Varicella-Zoster Virus (VZV)

Transmission: Respiratory droplets, direct contact

Symptoms: Itchy vesicular rash, Painful, dermatomal vesicles

Treatment: Acyclovir for severe cases, VZV vaccine prevents

Diagnosis: PCR, Tzanck smear

A

Chickenpox & Shingles

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12
Q

Transmission: Respiratory droplets

Symptoms: “Slapped-cheek” rash, fever, arthralgia

Treatment: Supportive

Epidemiology: More common in children, can cause fetal anemia in pregnant women

Diagnosis: Serology, PCR

A

Erythema Infectiosum (Fifth Disease)

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12
Q

Cause: Human Herpesvirus 6 (HHV-6)

Transmission: Saliva

Symptoms: High fever (3-5 days), rash appears after fever resolves

Treatment: Supportive

Epidemiology: Common in infants

Diagnosis: Clinical presentation

A

Roseola (Exanthem Subitum)

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13
Q

A diabetic patient presents with rapidly spreading skin discoloration, extreme pain, and fever. What is the likely diagnosis?

A

Necrotizing fasciitis

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14
Q

A patient with a deep laceration from an accident develops severe pain disproportionate to the wound size. What is the next best step?

A

Immediate surgical debridement and IV antibiotics

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15
Q

A 16-year-old with persistent cystic acne not responding to topical treatment asks for stronger medication. What is a possible option?

A

Isotretinoin (if severe and unresponsive to other treatments)

16
Q

female patient develops acne flare-ups before her menstrual cycle. What is the likely cause?

A

Hormonal fluctuations

17
Q

A child presents with a fever and swollen lymph nodes after a recent cat scratch. What is the most likely diagnosis?

A

Cat scratch disease

18
Q

A patient has persistent swollen lymph nodes and fatigue after a cat bite. What test can confirm the diagnosis?

A

Serology or PCR for Bartonella henselae

19
Q

A burn patient develops a wound with green pus and a sweet odor. What is the likely causative organism?

A

Pseudomonas aeruginosa

20
Q

A hospitalized patient on a ventilator develops pneumonia. What bacteria should be suspected?

A

Answer: Pseudomonas aeruginosa

21
Q

A hiker develops a fever and rash starting on the wrists and ankles after a tick bite. What is the likely diagnosis?

A

Rocky Mountain Spotted Fever

22
Q

A physician hesitates to give doxycycline to a child with suspected RMSF. What should be advised?

A

Doxycycline is still the first-line treatment despite age

23
Q

A farmer presents with a painless black lesion with surrounding swelling. What is the likely diagnosis?

A

Cutaneous anthrax

24
Q

What is the first-line antibiotic for suspected anthrax exposure?

A

Ciprofloxacin

25
Q

A patient with a deep wound develops foul-smelling discharge and crepitus. What is the likely diagnosis?

A

Answer: Gas gangrene

26
Q

What imaging finding supports gas gangrene?

A

Answer: Gas bubbles in soft tissue (on X-ray or CT)

27
Q

A patient has painful genital ulcers with recurrent episodes. What is the likely cause?

A

Answer: HSV-2 infection

28
Q

What is the first-line treatment for herpes outbreaks?

A

Answer: Acyclovir or Valacyclovir

29
Q

A patient presents with multiple rough, raised lesions on the fingers. What is the likely cause?

A

Answer: Common warts (HPV)

29
Q

What treatment is commonly used for genital warts?

A

Answer: Imiquimod cream or cryotherapy

30
Q

A patient presents with pearly skin nodules with central dimpling. What is the likely cause?

A

Answer: Molluscum contagiosum

31
Q

Why is smallpox no longer a major health concern?

A

Answer: It was eradicated by vaccination

32
Q

A pregnant woman develops a mild rash and fever. What infection should be ruled out?

33
Q

What is the best prevention for rubella?

A

MMR vaccine

34
Q

A child has fever, cough, and white spots on the buccal mucosa. What is the likely diagnosis?

A

Answer: Measles (Koplik spots)

35
Q

What vitamin helps reduce complications of measles?

36
Q

An elderly patient develops a painful, blistering rash along a single dermatome. What is the diagnosis?

37
Q

What vaccine prevents shingles in older adults?

38
Q

“Slapped cheek” rash, fever, joint pain

A

Erythema Infectiosum (Fifth Disease)

39
Q

Cause: Human herpesvirus 6 (HHV-6)
Transmission: Saliva
Symptoms: High fever, then rash appears after fever subsides