ID Exam 3 Flashcards
Remdesivir MOA
Converted to monophosphate and phosphorylated to its active metabolite which interfered with the action of viral RNA causing a decrease in viral RNA production
Remdesivir route
IV
Remdesivir ADE
Nausea
Elevated ALT and AST
Remdesivir DDIs
Chloroquine phosphate or hydroxychloroquine sulfate
CYP 2C8, 2D6, 3A4
Paxlovid MOA
Acts as covalent inhibitor binding directly to catalytic cysteine interfering with the replication of SARS
Paxlovid ADME
High fat meal increase exposure
Paxlovid side effects
Dysgeusia
Diarrhea
HTN
Myalgia
Paxlovid contraindications
USE during pregnancy
Paxlovid DDIs
Cyp3A4
Molnupiravir MOA
Competitive inhibitor for viral RNA dependent RNA polymerase. Indices an antiviral effect via viral error catastrophe
Molnupiravir ADE
Maculopapular rash
BBW serious infections possible
Oseltamivir (prodrug) MOA
Inhibition of neuraminidase activity leading to viral aggregation at cell surface
Oseltamivir ADME
Rapid absorbed
Renal entirely excretion
Oseltamivir DDIs
Live attenuated flu vaccine (intranasal)
Zanamivir MOA
Inhibitor viral neuraminidase and causes viral aggregation at cell surface and reduced spread of virus within respiratory tract
Zanamivir ADME
Deposited in lower respiratory tract and oropharynx
Zanamivir DDIs
Love attenuated flu vaccine (intranasal)
Zanamivir ADE
Sinusitis, dizziness
Muscle and nerve aches
Amantadine and Rimantadine MOA
Inhibit viral replication
Interfere with viral assembly
Amantadine and Rimantadine ADME
Well absorbed
Large Vd
Dose adjust in renal patients
Amantadine and Rimantadine ADE
CNS/GI
Neurotoxic
Pregnancy category C
Viral infection depend on host cell metabolic process for survival and obligate intracellular what
Parasites
What are the 5 sites that could be a drug target
Attachment
Entry
Uncoating (replication and gene expression)
Assembly (plus budding if envelope)
Release
Pathogenesis of viral infections
Enter through mucosa of respiratory or GI through direct inoculation
Replicate at site of entry
Few spread through neural cells
Pathogenesis: viral shedding, cell injury, clinical illness
viral shedding: into environment to perpetuate virus, occurs from body surface
cell injury: destruction of infected cells
clinical illness: organ function, inflammatory response to tissue injury
What is the highest burden population for flu
Children younger than 5
Adults 75 years and older
What is the initial side of virus for flu
Nasopharyngeal
(Can cause pneumonia)
What is the flu life cycle
Adhesion of virus
Endocytosis and fusion
Uncoating
RNA replication
Packaging and Building
Release of progeny virus
What is antigenic drift
Small changes and mutation to in genes leading to changes to HA and NA (viral antigens)
What is antigenic shift
Abrupt acquisition of new hemagglutinin and neuraminidase by flu
Results in novel flu virus
Flu pathophysiology
Person to person from respiratory droplets
Incubation period of 1 and 7 days
Viral shedding can persist for weeks to months
Who is at high risk for flu complications
Pregnant women
Children over 6 months
Elderly
People with aphasia
Immunocompromised
Chronic disease pts
Obese
Health care workers
Non pharmacotherapy for flu
Sleep
Rest and prevent spread
Fluids
Who to treat for flu
Hospital with flu
Outpatient (illness, high risk, under 2 over 65, pregnancy)
Oseltamivir indication, age, dose
treatment: any age
prophylaixs: >3 months
dose: 75mg bid x5d w/in 48 hours of symptoms onset
reduction of 1.5 days of improvement
drug of choice in severe flu
Zanamivir indication, age, dose
treatment: >7 years
prophylaixs: >5 years
10 mg inhaled bidx5d w/in 48 hours of symptoms onset
reduction of 1.5 days of improvement
not for asthma or COPD
Peramivir indication, age, dose
treatment: >2 years
600 mg IVx1 infused 15 min w/in 48 hours of symptoms onset
reduction of 1 day of improvement
only IV
Baloxavir indication, age, dose
treatment: >12 yrs
weight based:
40-79 kg 40 mg
>80 kg 80 mg
w/in 48 hours of symptoms onset
reduction of 1.5 days of improvement
no dairy, not for high risk
What is the main genera within the subfamily virology of corona
betacoronavirus
What does the alpha and beta CoV genera known to infect? what about gamma and sigma
alpha and beta: infect mammals
gamma and sigma: infect birds
What has a higher affinity SARS-CoV-2 spike or SARS-CoV spike
SARS-CoV-2 spike
What are the three phases of disease progression of COVID
Stage 1: viral response (inhibit viral replication)
Stage 2: pulmonary phase
Stage 3: host response hyperinflammation (immune modulation)
Stages of clinical presentation of COVID
stage 1: cold like, smell disorders, lymphopenia, one week from onset
stage 2: respiratory distress and coughing, one week to 10 days
stage 3: ARDS, SIRS/shock, cardiac failure, after 10 days
HSV presentation
eye
skin
brain
neonatal transmission
EBV presentation
infectious mononucleosis (fever, sore throat)
contagious
no treatment
nasopharyngeal carcinoma and burkitts lymphoma
CMV presentation
problem in immunosuppressed host (transplant, HIV)
CNS, retina, lungs
treatment: ganciclovir, valganciclovir
prophylaxis: letermovir, ganciclovir, valganciclovir
Varicella Zoster
primary form of infection (contagious)
chickenpox
-rash, malaise, pruritis, scabs
infectious up to 5 days after vesicles crusted
Chicken Pox presentation
first exposure to varicella zoster
full body rash
highly contagious
common in children
live virus vaccine
Shingles presentation
reactivation of varicella zoster
local rash
post herpetic neuralgia
>50 yo
recombinant vaccine
Chickenpox treatment
itching: cut nails, calamine, benadryl, burows soln
fever: apap
virus: acyclovir
Herpes Zoster shingles cause and effects
shingles can occur w/out chickenpox
thoracic and lumbar regions most common place
can effect eyelids (could lead to eyesight loss)
Shingles treatment
pain precedes eruption of lesions
lesion crust over 3-5 d and resolve in 14 d
painful
acyclovir and valacyclovir treatment started w/in 72 h
How to prevent herpes zoster
vaccine
>50 yo
>19 if immunocompromised
can vaccinate if had singles
What is the most common otitis media pathogens
strep pneumoniae***
haemophilus influenzae
moraxella catarrhalis
What disease most commonly occurs following a brief, upper respiratory illness, including the “common cold”
otitis media
Otitis media may be recognized in kids that do what
tug on ears
hearing may be muffles (louder volumes on toys, tv)
Diagnosis of otitis media is dependent upon PE of what
bulging tympanic membrane + onset + pain
otorrhea may be present
What are the three indications for antibiotics of otitis media
children aged 6 months or older w/ severe symptoms (toxic) pain >48 hr or temp >102.2 F
children aged 6 months or older with otorrhea
children btw 6-23 months w/ bilateral otitis media
First line therapy for otitis media
amoxicillin (BID)
augmentin (BID, used if other criteria present)
2nd/3rd gen cephalosporins (PCN allergy)
Therapy for otitis media if failure at 48-72 hours
ceftriaxone IM
augmentin (use if not already used)
What is the specific criteria for using augmentin as first line therapy for otitis media
recent amoxicillin use w/in 30 days
concurrent purulent conjunctivitis
history of recurrent infections unresponsive to amoxicillin
Duration of treatment for Otitis Media
5-10 days
10 days for children <2 or complicated course
The vast majority of sinusitis diagnosis is _____ in nature
viral
What is the common pathogens for acute bacterial rhinosinusitis
s. pneumoniae***
h. influenzae
m. catarrhalis
The majority of acute bacterial rhinosinusitis cases initiate as a respiratory tract infection what is the pathophysiology
respiratory infection causes mucosal inflammation
inflammation allows bacteria to migrate
outflow of sinus cavity becomes impaired
Hallmark symptoms of bacterial rhinosinusitis
last for 10 d w/out clinical improvement (pain, pressure)
fever >102.2 F
worsening symptoms (new fever, headache, increase nasal discharge)
First line therapy for acute bacterial rhinosinusitis
augmentin (BID)
clindamycin + cephalosporin (TID, PCN allergy)
Levofloxacin (PCN allergy)
Moxifloxacin (PCN allergy)
Doxycyclin (BID, for adults