infectious disease Flashcards
Travellers diarrhoea Cause
E. Coli
Meningococcal prophylaxis for close contacts
PO Ciprofloxacin/ Rifampicin
Bacterial Meningitis Mx
IV Cefotaxime (+Amoxicillin <3yo or >50yo)
Meningococcal meningitis Mx
IV Benpen/ Cefotaxime/ Ceftriaxone
Meningitis caused by Pneumococcal or Haemophilus Mx
IV Cefotaxime/ Ceftriaxone
Meningitis caused by Listeria Mx
IV Amox + Gent
Causes of bloody diarrhoea
Shigella - vomiting, abdo pain
Campylobacter - flu-like prodrome, fever, abdo pain
Amoebiasis - gradual onset, weeks maybe
Gonorrhea (Gram neg diplococcus) Mx
1st - IM Ceftriaxone + GUM clinic
2nd - PO Cefixime + PO Azithromycin
Lyme disease Ix
1st - Erythema Migrans - clinical diagnosis
2nd - ELISA for Borrelia Burgdorferi (repeat after 4-6 weeks if initial test negative, but is suspected)
3rd - immunoblot test
Lyme disease Mx
Doxycycline
Or Amox (eg pregnancy)
Animal or Human bite Mx
Co-Amoxiclav
If pen allergy - Metro + Doxy
Diarrhoea incubation periods
1-6 hrs
12-48 hrs
48-72 hrs
> 7 days
1-6 hrs: Staphylococcus aureus, Bacillus cereus*
12-48 hrs: Salmonella, Escherichia coli
48-72 hrs: Shigella, Campylobacter
> 7 days: Giardiasis, Amoebiasis
Chlamydia Ix
women - vulvovaginal swab
men - urine sample
both sent for nucleic acid amplification tests (NAATs)
UTI in pregnancy
1st - Nitrofurantoin (Cefalexin if third trimester)
2nd - Amox/ Cefalex
Asymptomatic bacturia should be treated as UTI
Genital wart treatment
multiple, non-keratinised warts:
solitary, keratinised warts:
multiple, non-keratinised warts: topical podophyllum
solitary, keratinised warts: cryotherapy
If recurrent - Top Imiquimod
Salmonella (Typhoid) Mx
Ciprofloxacin
Rifampicin side effects
potent liver enzyme inducer
hepatitis, orange secretions
flu-like symptoms
Isoniazid side effects
peripheral neuropathy: prevent with pyridoxine (Vitamin B6)
hepatitis, agranulocytosis
liver enzyme inhibitor
Pyrazinamide side effects
hyperuricaemia causing gout
arthralgia, myalgia
hepatitis
Ethambutol side effects
optic neuritis: check visual acuity before and during treatment
Behcet’s syndrome (3)
Oral ulcers
Genital ulcers
Uveitis
(associated with DVTs)
Lymphogranuloma venereum (caused by chlamydia) Fx
painless genital pustule/ ulcer
painful inguinal lymphadenopathy
proctocolitis
Lymphogranuloma venereum Mx
Doxycycline
Epstien Barr virus association with what malignancies (3)
nasopharyngeal
Hodgkins
Burkitt’s lymphoma
Bacterial vaginosis cause
Gardnerella vaginalis
Live attenuated vaccines (7)
BCG
MMR
oral polio
yellow fever
oral typhoid
Influenza (intranasal)
oral rotavirus