Infectious diseases Flashcards
What are the key signs and symptoms of glandular fever?
Fever
Sore throat
Fatigue
Hepatosplenomegaly
What causes glandular fever (mono)?
EBV
What is diagnostic test for EBV?
EBV serology - confirms presence of IgM antibodies
What is treatment for c.diff?
Oral vancomycin
What must be started after chloroquine has been used for acute malaria?
Primaquine
What is primaquines role?
Only effective drug against hypnozoites - dormant liver stage parasites of plasmodium
Primaquine prevents another malaria relapse
What is the incubation period for plasmodium?
7-30 Days
What is gold standard diagnosis of malaria?
Thick and thin blood films
Which pneumonia is associated with reactivation of herpes?
Strep peumoniae
Which malarial prophylaxis should be avoided in epileptics ?
Mefloquine
What does periosteal reaction on X-ray indicate?
Presence of new bone formation in response to abnormal stimuli
How can osteomyelitis present?
Periosteal reaction
Fever
Pain
Positive blood cultures for salmonella typhi
Spleen impairment
What is the most common causative organism of osteomyelitis?
Staph aureus
AND
coagulase negative staph
What are the risk factors of osteomyelitis?
DM
PVD
Malnnourished
Immunosuppressed
Malignancy
Extreme age
How does osteomyelitis present?
Fever
Pain at rest
Swelling
Erythema at affected sight
What is gold standard management for osteomyelitis?
MRI
What is management for osteomyelitis?
LTM antibiotic (4-6 weeks for acute or 3-6 months for chronic)
Flucloxacillin plus fusidic acid/ rifampicin
What is antibiotic used in pen allergic in osteomyelitis?
Clindamycin
What is recommended first line prophylaxis for meningitis?
Ciprofloxacin
What would show up on a CT head with HSV encephalitis?
Focal bilat temporal lobe involvement
What are the signs/ symptoms of viral hsv encephalitis?
Rash around mouth
Headache
Behaviour changes
Drowsiness
Neck stiffness
Confused
What would you see on CT head with toxoplasmosis?
Ring enhancing lesions
Where does the measles rash start?
Behind ears and back of head
How does measles present?
4D’s - 4 days of fever and the 3C’s
3c: cough, conjunctivitis, coryza
How can hep d be contractedd?
Only if the person has contracted hep b as well - this is the druggy one
Which hep is usually vaccinated against before travel?
HepA
Which hep doesn’t have a vaccine?
Hep E
How can Hep E present?
Flu like illness
Jaundice
Hepatosplenoegaly
How is hep E spread?
Faecal oral route
What is cryptosporidiosis and what is it’s treatment?
Common cause of diarrhoea in HIV patients
Treat by starting them on anti-retrovirals
What is the most common cause of invasive fungal nail disease?
Trichophyton rubrum
What is treatment for trichophyton rubrum causing nail disease?
Oral terbinafine - 3-6 months
What is the most common cause of gastroenteritis?
Campylobacter jejuni
What is campylobacter jejuni incubation period?
48-72 hours
When does campylobacter jejuni occur?
After raw meat, dairy and drinking untreated water
Which bacterial meningitis usually presents with a non-blanching rash?
Neisseria meningitidis
What amount of parasitaemia is worrying for severe malaria vs severe disease?
more than 2% then more than 105
What is sugar levels like in severe malaria?
Hypoglycaemic - a blood glucose lower than 2.2 is worrying and needs admitting
What would be hospital treatment for severe malaria?
IV artesunate
What does oral hairy leucoplakia indicate?
Primary HIV infection
If patient is pen allergic what can be given for a CAP?
Clarithromycin of doxycycline
Which bacteria is found in reheated rice?
Bacillus cereus - due to improper cooking and refrigeration
Which disease has otitis media as a common complication?
Measles
What is treatment for uncomplicated malaria?
Oral artemisinin and combo therapy
What is first line treatment for impetigo - then second line when first line is not tolerated?
Topical hydrogen peroxide
If not tolerated then fusidic acid
How does mumps present?
Fever
Parotid gland swelling
Orchitis - in some cases
What is treatment for mumps?
Supportive care
What is gram staining of pertussis?
Gram negative coccobacillus
What’s the most common cause of CAP vs HAP?
CAP: strep pneumoniae
HAP: pseudomonas aerginosa
What is the most common cause of viral meningitis?
Coxsackie
Which pneumonia reactivates herpes sores around mouth?
Strep pneumoniae
How to test for strep pneumoniae?
Urinary antigen test
Which pneumoniae is associated with haemolytic anaemia ?
Mycoplasma
When should anti-retrovirals be started in HIV patients if patient has TB?
Delay retroviral for 4 weeks to prevent development of immune reconstitution inflammatory syndrome - occurs due to reactivation of immune system with antiretrovirals causing worsening of TB symptoms
What should be co-prescribed with isoniazid and why?
Vitamin B6 - Pyridoxine - because isoniazid can cause peripheral neuropathy
What is classic presentation of schistosomiasis exposure?
Abdo pain
Diarrhoea
Haematuria
Parasitic worms usually in infested waters with snails
What is the treatment for schistosomiasis?
Two doses of praziquantel
Which TB medication can cause orange discolouration of body fluids - like urine, sweat and tears
Rifampicin
What are EBSL?
E.coli and klebsiella species
Which antibiotics are first line for ESBL producing organisms?
Carbapenems
Give an example of a carbapenem?
Meropenem
When are carbapenam’s contraindicated?
If patient has had a anaphylactic reaction to penicillin
What is first line investigation for mumps?
Mumps salivary IgM
Which cholera serogroups are causative of cholera?
o1 and o139
Which is gram staining of cholera?
Gram negative comma-shaped and single polar flagellum
What are the signs and symptoms of cholera?
Sudden onset watery diarrhoea
Abdo cramps
Nausea
Vomiting
Thirst
Dry mouth
Dry skin
Oliguria
Drowsy
Lethargic
What is the gold standard test for cholera?
Stool culture
What is mainstay of treatment for cholera?
Aggressive fluid replacement
Which antibiotic is used in cholera treatment?
Doxycycline
What is treatment of tinia capitis - ringworm on head and why?
Topical ketoconazole and oral itraconazole - because there is poor penetration of topical agents through root of hair follicle to oral needed to
What is antibiotic treatment of cellulitis?
Flucloxacillin + benzylpenicillin if severe
If patient is pen allergic which medication is used for cellulitis?
Clarithromycin or clindamycin
If a patient has lymphoedema with cellulitis - how long would the antibiotics need to be taken for?
1-2 months
How long should a child stay of school with mumps?
Should not attend school for 5 days from onset of parotitis
What would be a positive result for TB induration?
5mm or more
What is treatment of gas gangrene?
Penicillin and clindamycin and debridement
Why may a rash present when amoxicillin is given for a sore throat?
EBV could be present
Which infectious disease presents with salmon coloured spots and non bloody diarrhea?
Salmonella - which can be called typhoid or enteric fever
What is a complication of Strep pyogenes?
Scarlet fever which can cause a rough erythematous desquamating rash
How is scarlet fever rash treated?
Oral phenoxymethylpenicillin - Pen V
Which antigen for hep b if found suggests vertical transmission to baby?
HBe antigen - as these patients are most infective
What is the gram staining of pseudomonas?
Gram negative aeruginosa
What is the treatment of pseudomonas?
Oral ciprofloxacin
What is treatment for asymptomatic tick bite?
Removal or tick - no antibiotic needed
What is treatment of suspected or confirmed lyme disease?
Oral doxycycline
Which pathogen causes leprosy?
Myobacterium leprae
What are the signs and symptoms of leprosy?
Coppery or hypopigmented anaesthetic patches
Nose destruction
Ear swelling
Leonine faces - face resembles a lion
Nerve thickening - commonly ulnar, median and radial
What is treatment for leprosy?
Rifampicin
Clofazimine
At least 1-2 years
What is treatment for cryptococcal meningitis?
2 weeks of IV amphotericin B and oral flucytosine followed by 8 weeks of fluconazole
What is treatment for CNS toxoplasmosis?
Oral pyrimethamine and sulfadiazine and folinic acid for 6 weeks after clinical resolution followed by long term maintance therapy
What’s the most common cause of wound associated botulism?
IV drug use
What investigation is used to detect toxin use?
Stool toxin ELISA
What antibiotic is used in whooping cough treatment?
Clarithromycin
What is the empirical treatment choice for osteomyelitis?
IV flucloxacillin and rifampicin
If a patient presents to GP with meningitis what is the treatment?
Ambulance and benzylpenicillin 1.2g IM
What is decolonisation therapy for MRSA? BTW MRSA colonisation on skin does not indicate infection and therefore antibiotics are not necessary
Nasal mupirocin
Chlorhexidine wash
What is the best medication for rheumatic fever?
Benzylpenicillin
What can indicate rheumatic fever?
Strep A
Erythema marginatum
Raised anti-strep O titre
What is staph scalded skin syndrome?
Red blistering skin and a positive Nikolsky sign - prodrome of sore throat or conjunctivitis may occur
Which TB drug is most likely to cause hepatotoxicity?
Pyrazinamide
How is leprosy transmitted?
Respiratory secretions
What is the medical management for a brain absess?
cephalospori + metronidazole for several weeks
and dexamethasone if there is raised ICP
What is treatment for pseudomonas UTI?
Gentamicin
Which antibiotic is used for vancomycin resistant enterococci?
Teicoplanin
If teicoplanin is not able to be used in vanc resistance what can be used?
Linezolid
When is interferon gamma release assay (IGRA) acid fast bacilli?
IGRA is used to detect latent TB in patients who have already been vaccinated with BCG.
Whereas acid fast bacilli is used for patient who have evidence of active infections
What test can help diagnose dengue fever?
Positive tourniquet test
What is the tourniquet test?
A blood pressure cuff is inflated to halfway between the systolic and diastolic blood pressure on the forearm and left in place for five minutes. After two minutes, the number of petechiae (small red or purple spots) is counted within a 2.5 cm square on the skin. The test is positive if there are more than 10 petechiae in the area
What is katayama syndrome?
Acute early inflammatory reaction to migrating eggs and larvae of schistosoma worm
What’s the most common zoonosis?
Brucellosis - livestock, unpasteurised milk
What is treatment for brucellosis?
Dual antibiotic for uncomplicated
Triple for complication - rifampicin, doxycycline, gentamicin or streptomycin for several weeks
What is empirical treatment for bacterial meningitis in kids younger than 3 months
IV cefotaxime and ampicillin
How can brucellosis present?
Unexplained fevers
Night sweats
Myalgia
Joint pain
Lymphadenopathy
Hepatosplenomegaly
Why does smoking increase risk of BV?
Anti-estrogenic effects from the polyaromatic hydrocarbons present in smoke
What is the most common causative agent of osteomyelitis?
Staph aureus
Which bacteria causes fever and gradual onset muscle spasms - trismus of jaw and tetanus ?
Clostridium tetanii
Which antibiotic is used for c.diff infection?
Vanc
What is first line treatment of acute rheumatic fever?
Stat dose of IV benzylpenicillin
What’s the treatment for schistomiasis?
Corticosteroids and praziquantel
What is best diagnostic imaging for osteomyelitis?
MRI
Which bones does osteomyelitis in sickles usually affect?
Femoral or humeral head
If a patient with co-morbidities presents with influenza what is the treatment?
Oral oseltamivir
What is Kehr’s sign?
Referred pain to shoulder tip caused by irritaition of diaphragm by intra-abdominal fluid
What is definitive management of hep c?
Antiviral combo therapy
What would investigations show with EBV?
Elevated liver enzymes
Leukocytosis
Positive heterophile antibody test
In which hep - hep A or E is the person at risk of contracting a more severe infection?
Hep E
What is treatment for lyme disease with arthritis?
Oral doxycycline for 28 days
Which TB medication can cause arthralgia ?
Pyrazinamide
If C diff becomes life threatening what is medication?
IV metronidazole + Oral vanc
Which medication can increase risk of C diff infection?
PPI
Which TB medication can cause liver derangement?
Pyrazinamide