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MedEd > Infection 1 > Flashcards

Infection 1 Flashcards

1
Q

HHV types?

A 
1 and 2 are HSV1/2.
3 = VSV
4 = EBV
5 = CMV
6/7 are 6/7
8 = 8
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2
Q

What can HSV-1 Cause?

A

Gingiovstomatitis, keratoconjunctivitis, herpes labialis, temporal lobe encephalitis.

ECZEMA Herpticum and herpteic whitlow

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3
Q

HSV-2 Presentation?

A 
Gential herpes (lifelong)
-> flu like prodrome
-> vesicles papules around gentials and anus
Shallow ulcers
Urethral discharge
Dysuria
Fever and Malaise
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4
Q

How does acyclovir work?

A

Guanosine analogue that inhibits viral DNA polymerase as anaologue of dGTP. Absence or 3’hydroxyl group prevents nucleoside attachment

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5
Q

HSV investigations and treatment?

A

Clinical diagnosis but mayb viral culture or HSV PCR

Topical, oral or IV acyclovir

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6
Q

Varicella Zoster incidence?

A

Is in dorsal root ganglia.
Chickenpox = 4-10
Shingles =>50 YO

90% adults VSV IgG +ve

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7
Q

Presentation of chickenpox?

A 
Prodromal malaise
Mild pyrexia
Generalised pruritic vesicular rash
Maculopapular
Contagious from 48hours until all vesicles crusted (7-10 days)
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8
Q

Shingles presentation?

A

May occur due to stress and tingling in dermatomal distribution followed by painful vesicular skin lesions. recovery 10-14 days

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9
Q

Investigations and Pox managment?

A

Clinical diagnosis, maybe PCR, viral culture or ELISA.

Chldren = treat symptoms with calamine otion, analgesia and antihisamines

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10
Q

Treatment and prevention of shingles?

A

1st line = valaciclovir or famciclovir
2ns line = acyclovir if within 72hours of appearance of rash.

VZIG for immunosuppressed and pregnant women exposed

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11
Q

Complications of VSV?

A

kids: bacterual sepsis, pneumonia, encephalitis and haemorrhagic complication

Adults: POSTHERPETIC NEURALGIA

Also: menigoencephalitis, myeltis, cranial nerve palsy, vasculopathy, GI ulcers, pancreatitis and hepatitis

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12
Q

EBV names and aetiology?

A

infectious mononucleosis and glandular fever.

90-95% of eople at some point and spread by saliva droplets.
Infects B lymphocytes and incorporation of viral DNA into host DNA

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13
Q

EBV presentation?

A

Fever, hepatosplenomegaly (jaundice), pharyngitis (tonsillar exudates) and lymphadenopathy (posterior cervical)

ATYPICAL LYMPHOCYTOSIS

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14
Q

EBV Investigations?

A

1) FBC (lymphocytosis) highest in week 2-3
2) Blood film - ^
3) Heterophile Abs
4) EBV Specific Abs
5) Rea time PCR for EBV DNA detection

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15
Q

EBV management?

A 
Supportive care (antiinflammatory and analgesics)
Corticosteroids if severe

AMOXICILLIN or ampicllin is contraindicated fue to widespread maculopapular rash

throat swab to exclude Group A strep

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16
Q

Components of EBV specific Abs?

A 
IgM, IgG and EBNA.
None = no infection
IgM = early infection
IgG+IgM = acute primary infection 
IgG+EBNA = past infection
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17
Q

Difference in presentation fro EBV and Strep pyogenes?

A

Strep has anterior cervical lymphadenopathy and no splenomgealy

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18
Q

Causative organism for purple, purpural lesion on nose?

A

HHV-8 (Kaposis)

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19
Q

HIV features?

A

Pneumocystic pneumonia

20
Q

How does HIV work?

A

Retrovirus (+sense RNA)

1) Enters CD4 lmphocytes via gp120 and chemokine receptor
2) Reverse transcriptase RNA to DNA
3) Viral DNA incoporated
4) Dissemination of virions leads to cell death
5) Eventually to T-cell depletion

21
Q

Methods of HIV transmission?

A

Sexual contact, pregnancy, childbrith and breastfeeding, occupational exposure, blood transfusion or organ transplant and injection drug use

22
Q

Stages of untreated HIV?

A

4F’s

1) Flu-like
2) Feeling Fine
3) Falling count and FInal crisis in AIDS

23
Q

Capsulated organisms in HIV presentation?

A

Strep pneumoniae

Haemophilus influenzae

24
Q

Bacterial presentation for HIV?

A

Mycobacteria (lungs GI skin), staphylococci, salmonella, capsulated organisms

25
Q

Viral presentation of HIV?

A

CMV, HSV (encephalitis), VSV (recurrent shingles), HPV (warts), papovavirus (progressive multifcal leukoencephalopatgy), EBV (oral hairy leukoplakia)

26
Q

Protozoal presentation of HIV?

A

Toxoplasmosis, crytosporidia and microsporidia (diarrhoea)

27
Q

Common HIV XRAY?

A

Severe, bilateral pukmonary interstitial infiltrates with pneumotoceles

= Pneumocystic pneumonia

28
Q

What is jairy leukoplakia?

A

Irregular, white, painles tongue plaques that cannot be scraped iff.

EBV mediated in HIV positive patients

29
Q

Candidiasis conditions and RFs?

A

Oral candidiasis and oesophageal thrush = immunocompromised

Vulvovaginitis = diabetes and Abx use

Duiaper rash

Infective endocarditis (IV drug users)

Disseminate candidiasis (in neutropenic patients

30
Q

Signs/symptoms pof candidiasis?

A 
Oral = dysphagia
Vulvo/balanitis = thick discharge, itching, soreness, redness

Disseminated = fever, hypotension +/- leucocytosis

31
Q

Investigations for candidiasis?

A

Swabs not routinely done.

To exclude others:
Urinalysis (uti), Blood glucose (diabetes), HIV Ab test and vaginal pH test (UTI)

32
Q

What are the HIV associated tumours?

A

Kaposi sarcome (HHV8). Pink or violaceous (purple) patch on skin or mouth. In AIDS defining condition.

Squamous cell carcinoma = particularly cervical or anal from HPV

Lymphoma

Treatment = chemotherapy + radiotherapy or anorectalexcision and colostomy

33
Q

What are the 1st line HIV investigations?

A

1) ELISA (western blot)
2) Serum HIV rapid test
3) Serum HIV DNA PCR (Infants)
4) CD4 count
5) Serum viral load (RNA)

34
Q

What are other HIV investigations?

A

Drug resistance therapy, serum Hep B and C, treponema pallidum haemagglutination test (syphilis)
Tuberculin skin test (TB)
FBC, U&Es, LFTs

35
Q

What is and aetiology of tonsillitis?

A

Acute infection of parenchyma of palatine tonsils. May occur in isolation or part of generalized pharyngitis

Viral (Common): Rhinovirus, coronavirus, adenovirus, EBV

Bacterial: Group A strep, mycoplasma pneumoniae, neisseria gonorrhoea

36
Q

Investigations for tonsillitis?

A

Rapid streptococcal antigen test

Throat culture

37
Q

Signs and symptoms of tonsillitis?

A

Pain on swallowing, temp >38, tonsillar exudate, sudden onset sore throat, tonsillar erytherma and enlargement, anterior cervical lymphadenopathy

38
Q

What are the centor criteria?

A

\Tonsillar exudate, tneder anterior cervical lymphadenopathy or lympohadentism hisotyr of fever >38
Absence of cough.

2 or less = no further investigations
3 or more = rapid streptococcAL ANTIGEN TEST

39
Q

Common Cold definition and investigations?

A

Mild, self-limiting, upper respiratory tract infection characterized by nasal stuffiness adn discharge, sneezing, sore throat and cough

Clinical diagnosis: consider FBC, throat swab, sputum culture, CRP, CXR

40
Q

Common cold signs and symptoms?

A

Runny or blocked nose, sneezing, sore throat, cough, headache, malaise and fever.

Usually clear in 7-10 days

41
Q

Management of common cold

A

hydration, analgesic, antipyretic, decongestant (oxymetazozline nasal, ipratropium nasal) +/- antihistamine, antitussive

42
Q

Common respiratory tract bacteria?

A

Strep pneumoniae, haemophilus influenzae, moraxella catrrhalis

43
Q

Abscess definition and aetiology?

A

Collection of pus that builds up in tissue, organ or confined space walled off by fibrosis.

Usually bacterial infection but rarely parasite or foreign sbstance

44
Q

Most common skin abscess cause and signs?

A

Staph aureus. Erytherma, hot, oedema, pain and loss of function

45
Q

Investigations fr abscess?

A

Hx, examinations, obvs, CLINICAl diagnosis and USS

46
Q

Management for absces?

A

Uncomplicated: aspiration, incision and drainage and no need for Abx

Severe or multiple sites: Abc, incision and drainage, excision if serious

47
Q

Features of toxoplasma gondii?

A

Associated with cats. Can cause myocarditis, encephalitis, Focal CNS signs, stroke and seizures.

CT - characteristic multiple ring-shaped enhancing lesions

MedEd (32 decks)

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