ID Flashcards
Brodie’s abscess presentation and X-ray findings
Chronic osteomyelitis, insidious onset. Localised abscess often near the site of the metaphysis
Xray: Lytic lesion with sclerotic margins
“Honeycomb” appearance on limb xray
Osteomyelitis - thickened bone with irregular and patchy sclerosis
When are topical aminoglycosides c/i in otitis externa
If the TM is perforated
Note acetic acid can be used as 1st line treatment if there is no hearing impairment or discharge
Side effect of chloramphenicol ear drops
Contact dermatitis (10% of people)
Mechanisms of action of the 3 drugs in typical PEP for HIV?
2 nucleoside reverse transcriptase inhibitors plus either non nucleoside RT inhibitor, protease inhibitor or integrase inhibitor
1st line antibiotics for pyelonephritis in patient > 3months
Oral: cefalexin or co-amoxiclav
If IV required co-amoxiclav
NICE guidelines on UTI criteria for diagnosis of pyelonephritis?
Bacteriuria and fever 38C or higher
or fever less than 38 with loin pain/tenderness and bacteriuria
Onset of staph aureus food poisoning usually starts about 24hrs after ingestion of contaminated food T/F
F - onset is usually from 30 minutes to 8 hours post ingestion.
Diarrhoea with s aureus gastroenteritis is usually profuse and watery T/F
T - symptoms start with emesis and then diarrhoea a few hrs later, usually only symptomatic for one day
Vibrio vulnificus is classically associated with what food?
Oysters
Note: other seafood too. Symptoms vomiting, diarrhoea and fever about 24-48 hrs after ingestion
How long after ingestion of contaminated food does presentation with clostridium perfringens (welchii) or botulinum typically occur?
6-12 hours
What finding on a CBC is highly indicative of a helminth infection?
Eosinophilia
Antibiotics are routinely prescribed as part of the management of dental abscess T/F
F - only prescribed if the patient is systemically unwell
Mgmt is analgesia and dental referral
What is a kerion?
A large swelling that is a complication of tinea capitis, it is a hypersensitivity reaction
What is the treatment of a kerion?
Systemic antifungal +/- a short course of steroids
Herpes is a DS DNA virus T/F
True
Haemophilus ducreyi causes what STI?
Chancroid
Note: painful necrotising genital ulcer; it is a gram neg cocci
E coli is able to multiple in typical fridge temperatures of about 4degrees T/F
False - E coli can survive but not multiply.
Listeria monocytogenes can grow/multiple at temperatures of 0-4degrees C
Prophylactic antibiotic(s) of choice for meningitis exposure What should be used for a pregnant patient
Ciprofloxacin or Rifampicin
Pregnancy: ceftriaxone
Hepatosplenomegaly is common in which Reye’s syndrome, malaria, dengue or leptospirosis?
Malaria
Hepatomegaly is common in other diseases but splenomegaly is rare in the other disease
What is the incubation period of Dengue?
5-10 days
Note: incubation period for leptospirosis is 7-12 days
Patient’s with malaria may be hyper or hypoglycaemic at presentation T/F
F - hyper is usually earlier in disease and hypoglycaemia is in more severe disease or cerebral malaria
Other common findings in malaria - symptomatic haemolytic anaemia (systolic murmur) with hepatosplenomegaly and jaundice
Neisseria meningitidis morphology
Gram -ve coccus
Is psuedomonas aeruginosa gram + or -
Gram -ve