Infectious Diseases Flashcards
What is NAAT? What is it testing for?
Nucleic acid amplificaiton test for chlamydia
What would a ground glass appearance on histology indicate?
Chronic hep b infection
What is the treatment for gonorrhoea?
IM ceftriaxone
What would you see on microscopy of gonorrhoea?
Gram negative diplococci
What is the treatment of chlamydia?
Oral doxycycline or azithromycin
In a traveller in bangladesh with watery diarrhoea and hypoglycaemia, what would you be worried about?
Cholera
Name 2 diseases which may cause blood in the stool.
Campylobacter jejuni and salmonella.
Frothy offensive discharge + vulvovaginitis + strawberry cervix _ very acidic vagina =??
Trichomonas vaginalis
In which condition would you see rose spots on the chest, and what is the causative organism?
Typhoid, salmonella typhi.
How would you distinguish between giargiasis and typhoid fever?
Giardiasis = diarrhoea Typhoid = constipation
What is the treatment for invasive (bloody) diarrhoea?
Ciprofloxacin
What is the treatment for traveller’s and non-invasive diarrhoea?
Clarithromycin
What is the treatment for cerebral toxoplasmosis? (Seen in HIV with a CD4 count <200)
sulfadiazine and pyrimethamine
Painless ulcer and painless lymphadenopathy?
Syphilis
Painless ulcer and painful lymphadenopathy
Lymphogranuloma venereum
Painful ulcer and painful lymphadenopathy?
Chancroid
What is the most common cause of intermenstrual bleeding in a young female?
STI e.g. chlamydia
What is the treatment for syphilis?
IM benzathine penicillin
What does e.coli look like under a a microscope?
Gram negative rod
What is the most common cause of traveller’s diarrhoea?
E.coli
If the CSF glucose is less than half of the serum glucose, what is causing the meningitis?
Bacteria
If the CSF white cells are mostly lymphocytes, what is the cause of the meningitis?
TB
What is given after a bite from a rabid dog?
Immunoglobulin + rabies vaccination
What antibiotic is used to treat exacerbations of chronic bronchitis?
Amoxicillin
What antibiotic is used to treat uncomplicated community-acquired pneumonia?
Amoxicillin
What antibiotic is used to treat CAP following flu?
Amoxicillin + flucloxacillin
What is the likely causative organism of pneumonia following flu?
S. aureus
What antibiotic is used to treat atypical pneumonia (e.g. legionalla, mycoplasma?)
Clarithromycin
What antibiotic is used to treat hospital acquired pneumonia within 5 days of admission?
Co-amoxiclav or cefuroxime
What antibiotic is used to treat hospital acquired pneumonia more than 5 days after admission?
Piperacillin with tazobactam
What antibiotic is used to treat acute pyelonephritis?
broad spectrum cephalosporin or quinalone
What antibiotic is used to treat impetigo?
topical fusidic acid
What antibiotic is used to treat widespread impetigo?
Erythromycin
What antibiotic is used to treat cellulitis?
Flucloxacillin
What antibiotic is used to treat animal or human bites?
Co-amoxiclav
What antibiotic is used to treat mastitis during breastfeeding?
Flucloxacillin
What antibiotic is used to treat throat infections?
Phenoxymethylpenicillin
What antibiotic is used to treat SINUSITIS AND OTITIS MEDIA?
Amoxicillin
What antibiotic is used to treat otitis externa?
Flucloxacillin + corticosteroid
What antibiotic is used to treat gonorrhoea?
IM cetfriaxone + oral azithromycin
What antibiotic is used to treat chlamydia?
Doxycycline or azithromycin
What antibiotic is used to treat pelvic inflammatory disease?
oral flucloxacillin and oral metronidazole
What antibiotic is used to treat syphilis?
benzathine benzylpenicillin
What antibiotic is used to treat BV?
metronidazole
What antibiotic is used to treat c.diff?
Metronidazole
What antibiotic is used to treat campylobacter enteritis?
Clarithromycin
What antibiotic is used to treat salmonella?
ciprofloxacin
What antibiotic is used to treat shigellosis?
Ciprofloxacin
Describe the appearance on microscopy of s. aureus?
Gram positive cocci
Haemolytic
Catalase positive
Describe the appearance on microscopy of strep pyogenes?
Gram positive coci in chains
Beta haemolytic
Catalase negative
What antibiotic is used to treat strep pyogenes?
Macrolides (azithromycin, clarithrmoycin)
Describe the appearance on microscopy of E.coli?
Gram negative rods
Describe the appearance on microscopy of campylobacter jejuni
Gram negative non-sporulating
What are the features of campylobacter jejuni infection?
Bloody diarrhoea
Right iliac fossa pain
Describe the appearance on microscopy of H.pylori
gram negative helix shaped rod
How is giardiasis spread?
Faeco-oral route
What are the features of Giardia infection?
Prolonged Non bloody diarrhoea
Flatulence
Bloating
What is the treatment of giardia infection?
Metronidazole
Where might you contract giardia?
Contaminated water e.g. lakes, rivers
What is the most common cause of gastroenteritis/traveller’sdiarrhoea?
E.coli
Traveller with watery stools, abdominal cramps and nausea…
What is the causative organism?
E.coli
Patient with prolonged, non-bloody diarrhoea.
What is the causative organism?
Giardia
What causes rice-water diarrhoea?
Cholera
Bloody diarrhoea, fever and abdominal pain.
What is the causative organism?
Shigella
What commonly causes acute food poisoning?
Staphylococcus aureis or bacillus cereus
Severe vomiting with a short incubation period.
What is the causative organism?
S.aureus
Vomiting and diarrhoea 6 hours after eating rice.
What is the causative organism?
Bacillus cereus
Gradual onset bloody diarrhoea, abdominal pain and tenderness which may last for several weeks…
What is the causative organism?
Amoebiasis
Name 2 organisms with an incubation period longer than 7 days.
Giardia, amoeba
What organism causes amoebiasis?
Entamoeba histolyica
Is the incubation period for amoebiasis short or long?
Long
What is the treatment of amoebiasis?
Metronidazole
Name 2 complications of amoebiasis?
Liver and colonic abscesses
“Anchovy sauce” in a liver abscess indicates?
Amoebiasis
What kind of virus is Parvovirus B19
DNA virus
What causes erythema infectiosum? How is it colloquially known?
Erythema infectiosum, slapped cheek syndrome
Are children with slapped cheek infectious?
Not once the rash has appeared
What to do if a pregnant women (<20 weeks) is exposed to parvovirus B19?
maternal IgG and IgM need to be checked
What causes infectious mononucelosis in 90% of cases?
EBV, or HHV-4
What are less common causes of infectious mononucleosis?
HHV-6, cytomegalovirus
Sore throat + fever + lymphadenopathy = ?
Infectious mononucleosis
Name a complication of infectious mononucleosis? How can this be avoided?
Splenomegaly and splenic rupture; avoid contact sports for 8 weeks post infection
How is glandular fever diagnosed?
Monospot test (heterophil antibody test) in the 2nd week of illness
What causes genital herpes?
HSV 2
What causes oral herpes?
HSV 1
Multiple painful genital ulcers is indicative of?
Genital herpes
What is a chancre?
A painless ulcer seen in primary syphilis
Painful genital ulcers associated with painful lymph enlargement is indicative of?
Chancroid
What causes chancroid?
Haemophilus ducreyi
Describe the ulcers you would see in chancroid
Sharply defined, ragged, undermined border
What causes Lymphogranuloma venereum (LGV)?
Chlamydia
How would LGV present?
Painless ulcer with painful lymphadenopathy
How is LGV treated?
Doxycycline
What is the management of genital herpes?
Oral acyclovir
What week of pregnancy is the cut off for having a c-section if there is a primary attack of herpes?
28
How should women with recurrent herpes be treates?
Suppressive therapy, transmission risk is low
Describe the quickSOFA score:
resp rate >22
altered mentation
bp <100
What does a qSOFA score of >2 indicate?
High risk of mortality
What type of vaccines would you not give to immunocompromised people?
Live, attenuated
Name the live attenuated vaccines
ROME Is MY Best Place To go
rubella oral polio mumps epidemic typhis Influenza Measles Yellow fever BCG Plague Typhoid
Name 3 vaccinations that are inactivated toxins
Tetanus, diptheria and pertussus
What causes croup?
Parainfluenza virus
What causes bronchilitis?
RSV
What most commonly causes bronchiectasis exacerbations?
Haemophilus influenzar
What pneumonia are you most likely to get following flu?
Staph aureus
What is the most common cause of CAP?
Strep pneumoniae
Who is at risk of lepstospirosis?
Farmers, sewage workers, vets, abbatoir workers etc
Erythema multiforme/target lesions are associated with what kind of pneumonia?
Mycoplasma
What is the antibiotic given in cellulitis for those who are penicillin allergic?
Clarithromycin
What is the first line treatment of cellulitis?
Flucloxacillin
Prolonged, watery diarrhoea in a returning traveller is…
Giardiasis
What type of cancer is most associated with Epstein-Barr virus?
Hodgkin’s lymphoma
What is the most likely causative organism in meningitis of a 0-3 month old?
group B strep, E.coli or listeria monocytogenes
Name 3 conditions amoxicillin is used to treat
otitis media, dental ansecces and community acquired pneumonia
What is the most likely causative organism in meningitis of a 60+ year old person?
Strep pneumoniae
Cloudy CSF with low glucose and high protein?
Bacterial meningitis
CSF with normal glucose and high protein?
Viral meningitis
Opaque CSF forms fibrin web with low glucose and very elevated protein?
Tuberculosis meningitis
Describe the diarrhoea in amoebiasis?
gradual onset bloody diarrhoea
lasts for weeks
some abdo pain
Describe the diarrhoea in Giardiasis
foul-smelling watery diarrhoea
weight loss
no abdo pain/fever
Name 2 conditions treated with flucloxacillin
Cellulitis
Severe otitis externa (severe)
What would you give for a human or animal bite?
Co-amoxiclav
What is the most appropriate first-line treatment for pneumonia possibly caused by atypical pathogens?
Clarithrmoycin