Micro Flashcards
What is the other name for HHV-1?
Herpes Simplex Virus - 1 ‘predominantly orofacial’
What is the other name for HHV-2?
Herpes simplex virus-2 ‘predominantly genital’
What is the other name for HHV-3?
Varicella zoster virus
What is the other name for HHV-4?
Epstein-Barr virus
What is the other name for HHV-5?
Cytomegalovirus
What is the other name for HHV-6a
Roseolovirus
What is the other name for HHV-6b
Herpes lymphotropic virus
What is the other name for HHV-8?
Kaposi’s sarcoma-associated herpesvirus
How is HHV-1 transmitted?
Muco-cutaneous contact
How is HHV-2 transmitted?
Muco-cutaneous contact
Where does persistent latent HHV1/2 reside?
Neural ganglia
What is a herpetic whitlow?
Lesion on fingers/hands caused by HSV
What are the signs/symptoms of herpes genitalis?
clusters of inflamed papules and vesicles
outer surface of genitals
When are you worried about a HSV infection during pregnancy?
A primary outbreak in the 3rd trimester
mother unlikely to have developed protective maternal antibodies to pass onto child in time
What is the treatment for primary HSV infection during pregnancy?
1st and 2nd trimester = oral/IV aciclovir for 5 days/until lesions stop forming
Last 4 weeks of pregnancy offer antiviral therapy.
Usually want to deliver by cesarean.
What is Mollaret’s meningitis?
A benign recurrent lymphocytic meningitis associated with HSV infection
Skin scrapings demonstrate multinucleated giant cells. What could the condition be?
HSV
VZV or HZV
Pemphigus vulgaris
CMV
This is known as the Tzanck test and the multinucleated giant cells are Tzanck cells
When is the fetus at greatest risk of developing neonatal varicella?
Exposure to infection 7 days before delivery
If a pregnant woman who is not immune to VZV and she has had a significant exposure, what should be the managment?
Offer varicella-zoster immunoglobulin as soon as possible
When is varicella-zoster immunoglobulin most effective?
Within 10 days of exposure
When should you not use varicella-zoster immunoglobulin?
Once a chickenpox rash has developed in a pregnant woman.
What treatment could you use for a pregnant woman who has developed chickenpox and what are the requirements in terms of presentation and gestation?
Oral aciclovir
if present within 24 hours of rash onset, ideally 20 weeks or more but can use it whenever.
What should a new mother with chickenpox be advised regarding breastfeeding her newborn?
She can breastfeed if she wishes to and is well enough to do so.
What are the signs/symptoms of Reye’s syndrome and what causes it?
Rash, vomiting, liver damage.
Post-viral, aspirin use in children.
What causes Ramsay Hunt syndrome type 2 and what are the signs/symptoms?
Reactivation of herpes zoster in the geniculate ganglion.
Triad: ipsilateral facial paralysis, ear pain and vesicles in the auditory canal/auricle
A 1 year old child develops a sudden high fever which lasts for a few days. A few days after the fever subsides a red rash appears - blanching rose-pink spots affecting the trunk, non-itchy/tender or blistering.
Roseola
- High fever for 3-5 days
- URTI
- Irritability and tiredness
- Rash around day 3-5 as fever subsides (small reddish spots that blanch, mainly trunk, fade away shortly)
What is the treatment for roseola?
Rest
maintain fluid intake
paracetamol for fever
14-3-3 protein is found on CSF analysis, what condition does this indicate?
CJD
MRI shows high signal intensity in the posterior thalamus on T2 weighted images, the radiologist murmurs something about the pulvinar sign. What condition does this indicate?
CJD - a/w pulvinar sign
What is the normal appearance of CSF?
Clear and colourless
What is the normal WCC of CSF?
0-5 - all lymphocytes, no neutrophils
What is the normal protein level in CSF?
0.2 - 0.4 or less than 1% of the serum protein concentration
What is the normal glucose level of CSF?
3.3 - 4.4 or greater than 60% of
What’s a normal opening pressure of CSF?
70 - 180 mmH20
The following CSF results come back:
- Cloudy
- Raised lymphocytes with polymorphs
- Very high protein
- Low glucose
Bacterial meningitis
will show WCC with neutrophils/polymorphs
The following CSF results come back:
- Normal appearance
- Raised lymphocytes
- Mildly raised protein
- Normal glucose
Viral meningitis
protein can be normal/raised. Glucose can be normal/low
The following CSF results come back:
- Slightly cloudy
- Raised lymphocytes
- Very high protein
- Very low glucose
Tuberculous meningitis
appears normal/cloudy, protein high/very high
The following CSF results come back:
- blood-stained
- normal WCC
- normal protein
- normal glucose
Subarachnoid Haemorrhage
Protein can be normal/high. Glucose can be normal/low.
The following CSF results come back:
- Normal appearance
- Noraml WCC
- Normal protein which rises over the next 7 days
- Normal glucose
Guillan-Barre Syndrome
The following CSF results come back:
- Normal appearance
- Raised lymphocytes
- High protein
- Normal glucose
- Oligoclonal bands and IgG
Multiple Sclerosis
The antiviral which is given to untreated pregnant women with HIV to prevent vertical transmission of the virus during childbirth.
Nevirapine ( a non-nucleoside RTI)
How is Oseltamivir administered and what strains of influenza does it treat?
influenza A and B
Oral
What is Ribavirin used to treat?
RSV infection
Hepatitis C infection
What is aciclovir’s mechanism of action?
Viral thymidine converts aciclovir to aciclovir monophosphate.
Host cells convert ACV-MP to ACV triphosphate.
ACV-triphosphate competitively inhibits and inactivates HSV-specified DNA polymerases
What is zidovudine used for?
HAART and PEP
What is Entecavir used in the treatment of?
Hepatitis B
Uses of nevirapine?
HIV - mother-to-child transmission
Uses of foscarnet?
HSV 1 + 2, drug-resistant CMV (and CMV retinitis)
Use of cidofovir?
CMV retinits
Paul Bunnell
Glandular Fever
Primary stomatitis
HSV-1
A herpes virus causing pneumonitis
CMV
Cause of herpes gladiatorum
HSV-1
Other name for exanthem subitum?
Roseola
Acute necrotising viral encephalitis
HSV 1
Cause of mollaret’s meningitis?
HSV 2
Alpha herpes virus
Neurotropic
beta herpes virus
Epiethliotropic
Gamma herpes virus
Lymphotropic
Alternative if penicillin allergic?
Erythromycin
long term prophylaxis for post-splenectomy patients?
Penicillin V
Pregnant or breastfeeding with active TB
Isoniazid
Contacts of people with TB
Isoniazid
Ghon focus
TB
Rich focus
TB
Auramine-rhodamine stain is reddish-yellow fluorescence
Acid-fast
mycobacterium usually, like TB
TB treatment
Side effect: Raised transaminase, CP450, orange secretions
Rifampacin
TB treatment
Side effect: peripheral neuropathy and hepatotoxicity
Isoniazid
TB treatment
Side effect: hyperuricaemia and hepatotoxicity
Pyrazinamide
Tb treatment
Side effect: optic neuritis, visual disturbances
Ethambutol (E for eye!)
Treatment multibacillary leprosy
Dapsone
Cofazimine
Rifampicin
Ziehl-neelson = blue
positive or negative?
negative
Ziehl-neelson = red
positive or negative?
positive
Rusty sputum
Lobar consolidation cxr
Gram positive diplococcous
S. pneumonia
Smoker
COPD
pnemonia
Gram negative cocco-bacilli
H. influenza
Smoker
Pneumonia
Gram negative coccus
M. catarrhalis
Post-influenza
cavitation on CXR
gram positive in clusters
S. aureus
Alcoholism elderly pneumonia haemoptysis gram negative rod enterobacter
K. pneumonia
Travel pneumonia Air con Water towers hepatitis low sodium
Legionella pneumophilia
Systemic symptoms pneumonia joint pain cold agllutinin erythema multiforme
Mycoplasma pneumonia
whooping cough
travelling community
bordatella pertussis
Streptococcus
Dark green agar under colony
“green haemolysis”
Alpha-haemolytic
- S. pneumoniae
- viridans streptococci
Streptococcus
complete haemolysis
agar appears lightened yellow and transparent
Beta-haemolytic
Group A strep (aka pyogenes)
Group B strep
Alpha haemolytic strep that is optochin sensitive
S. pneumoniae
Alpha haemolytic strep that is optochin resistant
S. viridans
Organisms that post-splenectomy patients are at risk of?
H. influenza
S. pneumonia
N. meningitidis
Mild-moderate community acquired classical pneumonia treatment
Amoxicillin or a macrolide if resistant
moderate-severe community acquired classical pneumonia
Clarithromycin + co-amoxiclav/cefuroxime
Treatment of atypical community acquired pneumonia
macrolide/tetracycline
Community acquired legionella pneumonia treatment
Macrolide and rifampicin
Community acquired staph aureus pneumonia treatment
Flucloxacillin
Hospital acquired MRSA pneumonia treatment
Vancomycin
Hospital acquired Pseudomonas pneumonia treatment
Piperacillin and tazobactam
Snail track oral ulcers Uveitis Alopecia Low grade fever Maculo-papular rash on palms and soles A cranial nerve palsy
Secondary syphilis
bilateral small pupils that reduce in size to near objects and that do not constrict when exposed to bright light
Argyll-Robertson pupil
Treatment for syphillis
IM Benzathine Penicillin
Jarisch-Herxheimer reaction
reaction to endotoxin-like products released by the death of harmful microorganisms within the body during antibiotic treatment
usually associated with penicillin treatment of syphillis
Temperature greater than 38.3C on several occasions
More than 3 weeks illness
failure to reach a diagnosis after one week of inpatient investigation
Pyrexia of Unknown origin
Accumulation of mutations within the genes that code for antibody-binding sites in viruses. Results in new strain of virus
Antigenic drift
Two or more different strains of virus combine to form a new subtype.
Antigenic shift
Influenza:
Catalyses sialic acid residues exposing host cell receptors and disrupting mucin barrier
Neuraminidase
Influenza:
Facilitates entry of the viral genome into the target cells by causing the fusion of host endosomal membrane with the viral membrane .
Haemagglutinin
Retinitis Colitis Hepatitis Encephalitis Pneumonitis
CMV effects ‘RCHEP’
Pyrophosphate analogue
Used to treat HSV or CMV that is drug resistant
Foscarnet
Treatment for CMV retinitis!
Cidofovir
Treatment for Hep B Virus
PegINF alpha 2a
Entecavir
Tenofovir
Mechanism of action of zanamivir
Neuraminidase inhibitor - influenza
Mechanism of action of oseltamivir
Neuraminidase inhibitor
Influenza mechanism of amantadine?
M2 proton channel interference
This guanosine analogue is used in treatment of severe RSV infection and often in combo with pegIFN alfa2a.
Ribavirin
Cause of hairy leukoplakia in HIV patients
Epstein-Barr virus
Virus associated with causing castleman’s diseaes
HHV8
Uncontrolled proliferation of B cell lymphocytes latently infected with EBV
Post-transplant lymphoproliferative disease