Review Flashcards
What causative agent of malaria has the worst prognosis?
Plasmodium Falciparum
How is malaria transmitted?
Bite of infected female anopheles mosquito
What are some S/Sx of poor prognostic factors of malaria?
- Marked agitation
- Hyperventilation
- Hypothermia
- Bleeding
- Deep coma
- Anuria
- Shock
What is the causative agent for the Plague?
Yersinia pestis
What is the vector for the plague?
Rat flea
What is the MC form of the plague?
Bubonic plague
What are some s/sx of the plague?
- F/C
- HA
- HypoTN
- Shock
- DIC
- Blood clots leading to arterial obstruction and acral gangrene = black death
What is the reservoir for ebola hemorrhage fever?
Fruit bats
How is ebola hemorrhage fever transmitted?
Consuming bushmeat
bats, gorilla, chimpanzees, shrews, and duikers
What are some clinical manifestations of ebola hemorrhagic fever?
Hemorrhage:
- Hematochezia
- Petechiae
- Ecchymosis
- Mucosal bleeding
- Hematemesis
How is schistosomiasis transmitted?
Blood flukes enter the skin from contaminated water (walking barefoot on the beach)
A clinical manifestations of schistosomiasis is Katayama fever, what species does that primarily occur with?
Schistosoma mansoni and Schistosoma japonicum
What are some s/sx of Katayama fever?
- Chest pain
- Hematochezia
- Hepatosplenomegaly
- F/C
What is a tx for schistosomiasis?
Praziquantel
What is the causative agent for toxoplasmosis?
Toxoplasma gondii
How is toxoplasmosis transmitted?
- Inhalation of oocysts from cat feces
- Vertical transmission from mother to fetus
- Ingestion of oocysts in raw pork
What is a manifestation of Toxoplasmosis transmitted congenitally?
Retinochoroiditis
What is the tx for Toxoplasmosis?
Pyrimethamine and sulfadiazine w/ Leucovorin
What is a clinical finding in a pt who has contracted scabies?
Linear burrows in interdigital web spaces
What is the hallmark sx in some with scabies?
Intense pruritus
What is the tx for scabies?
Permethrin cream
What is the MC bedbug in the US?
Cimex Lectularis
How is bedbugs transmitted?
Fomite contact: mattress, cushions, pillows, wooden bed crevices
S/sx of someone who has been bitten by bedbugs?
Urticaria and itching
What is tx for bedbugs?
- Malathion
- Lindane
- Calamine lotion
What is the causative agent for body lice?
Pediculus humanus corporis
Body lice is a human vector for what disease?
Rickettsia prowazekii - causative agent for epidemic typhus
What is the difference between flea bites and scabies bites?
Flea bites are more spread out lesions while scabies bites are more of a cluster and closer together.
What is the tx for ascariasis?
- Mebendazole
- Albendazole
- Ivermectin
What is the tx for Enterobiasis (pinworms)?
- Albendazole
- Mebendazole
- Pyrantel pamoate
What is the tx for Necatorisais (hookworm)?
- Mebendazole
- Albendazole
- Pyrantel pamoate
- AND Iron supplementation
What is the tx for Pork tapeworms?
Praziquantel
What is the tx for pork tapeworm if cystericosis occurs?
- Albendazole + Praziquantel + Steroids
- or Albendazole +/- steroids
What is the tx for beef tapeworms?
Praziquantel
What is the causative agent for Necatoriasis (hookworms)?
Necator americanus
What is the causative agent for enterobiasis (pinworms)?
Enterobius Vermicularis
What is the causative agent for pork tapeworms?
Taenia Solium
What is the causative agent for beef tapeworms?
Taenia saginata
What is the causative agent that caused a group of Mexican immigrants to get sick when they ate pickled pork?
Taenia Solium —> pork tapeworms
What lab work must be done in a pt with Necatoriasis?
Iron panel d/t iron deficiency anemia
How is Trichinellosis/Trichinosis transmitted?
Ingestion of encysted larvae in uncooked pork
What is the MC cause of death associated with Trichinellosis/Trichinosis?
Myocarditis
What is the tx for Trichinellosis/Trichinosis?
- Mebendazole or Albendazole
- and Prednisone
What is the causative agent for Lyme disease?
Borrelia Burgdorferi
What are the vectors for lyme disease?
Deer tick, sheep tick, taiga tick, black-legged tick
What is the rash called in someone who has lyme disease?
Erythema migrans
What is the tx for lyme disease?
Doxy
- alt: amox and cefuroxime
What is the causative agent of Rocky Mountain fever?
Rickettsia Tickettsii
What is the vector for Rocky Mountain fever?
Dog tick or rocky mountain wood tick
What clinical presentation would you see in someone who has been infected with Rocky Mountain fever?
Centripetal; “inward” macular rash, palms and soles involved
What is the tx for Rocky Mountain fever?
Doxy
- alt: chloraphenicol
What mosquito born disease will have a positive tourniquet test?
Dengue: febrile phase
What clinical manifestation can occur if a pregnant women is bitten by a mosquito carrying the Zika virus?
Microcephaly
What mosquito born disease has a vaccine available?
Japanese Encephalitis
What is the highest mortality/most severe mosquito born illness in the US?
Eastern equine Encephalitis
Where is Hantavirus Pulmonary Syndrome found?
All 4 corners
Where are rabies found?
Worldwide
What is the MC rabies vector in the US and Africa and Asia?
US: bats
Africa and Asia: Dogs
What laboratory diagnostic finding would you see in someone who is infected with rabies?
Negri bodies histologically
Mother brings pt in with poss. conjuctivitis, reports they just got back from Costa Rica, what disease do you suspect pt has?
Chagas disease
What is the causative agent for chagas disease?
Trypanosoma cruzi
Pt comes in with photophobia nonproductive cough, and acute fever you ask if he has around any birds and he reports he loves to play with birds especially parrots what do you suspect the pt has?
Psittacosis
What is the causative agent for Psittacosis?
Chlamydia psittaci
What is the tx for Psittacosis
Doxycycline or Tetracycline
HIV is a member of what virus group?
Retroviridae group of viruses
HIV attacks what specific immune cell?
CD4
What is the MC way HIV is transmitted?
Sexual contact
What is the MC way healthcare workers contract HIV?
Needle stick
What is the HIV post prophylaxis medication regimen?
Emtricitabine, Raltegravir, and Tenofovir
What is the HIV pre prophylaxis medication regimen?
Truvada: Emtricitabine/ Tenofovir DF
How often should you check the HIV antibody?
Every 3 mos
Crystal-induced nephropathy associated with what drug?
Indinavir (Protease inhibitor)
CNS sxs associated with what drug?
Efavirenz (NNRTI)
What is the prophlyaxis tx for pneumocystis pneumonia?
TMP/SMZ (bactrim)
What is the tx for thrush?
Nystatin: swish and swallow
What is the difference between Cryptosporidiosis and Cryptococcosis?
Cryptosporidiosis: causes diarrhea- infection affecting small bowel mucosa
Cryptococcosis: causes meningitis
Why are older pts at risk for HIV?
- Divorces and death of a spouse
- Erectile dysfunction meds
- Contraception no longer a concern
- postmenopausal
- Vaginal atrophy = small cuts/tears = increased blood exposure
- Less discussion during encounters with PCP
Why are women at risk for HIV?
- Irregular mensuration
- Recurrent vulvovaginal candidiasis
- HPV related cervical dysplasia
- Invasive cervical cancer
Why are children at risk for HIV?
Perinatal transmission- transplacental (MC)
In utero, during childbirth, breast-feeding
Pt recently had an organ transplant and is now being diagnosed with a fungal infection, what do you suspect she has?
Aspergillosis: Aspergillus fumigatus
What fungal infection will you see a halo on CT scan?
Invasive Aspergillosis
What fungal infection will you see a reverse halo on CT scan?
Mucormycosis
Pt reports he just got back from Michigan after digging lots of ditches and its presenting with flu-like sxs, what do you suspect?
Blastomycosis
What is the tx for Blastomycosis?
Mild to moderate: Itraconazole
Severe: Amphotericin B then Itraconazole
What fungal infection is most commonly associated with getting pricked by a rose thorn?
Sporotrichosis
What is the causative agent for Sporotrichosis?
Sporothrix shenckii
What is the tx for Sporotrichosis?
Itraconazole
What fungal infection would you suspect if pt reports he was crawling/ spelunking through caves near the Ohio river this past weekend?
Histoplasmosis
What is the causative agent for Histoplasmosis?
Histoplasma capsulatum
What is the tx for Histoplasmosis?
Mild to moderate: Itraconazole
Severe: Amphotericin B
What fungal infection is associated to disruption of soil during dust storm?
Coccidioidomycosis
What is the causative agent for Coccidioidomycosis?
Coccidioides immitis
Where is Coccidioidomycosis most likely to be found?
Desert region: Mexico, AZ, CA
What is the causative agent for cat scratch disease?
Bartonella Henselae
What is the drug of choice for cat scratch disease?
Azithromycin
What is the causative agent for infections in wounds (cellulitis) related to dogs and cats (ie cat bites)?
Pasteurella multocida
What is the treatment of choice for pasteurella multocida?
Amoxicillin-clavulanate (Augmentin)
What is the causative agent for Tularemia?
Francisella Tularenis
What is the hallmark clinical manifestation for Oculograndular Tularemia?
Painful auricular LAD
What are the hallmark clinical manifestations for Ulceroglandular Tularemia?
Ulcerated skin, regional LAD
Why are NSAIDS contraindicated in a pt with dengue hemorrhagic fever?
Thrombocytopenia
What is the AIDS defining cancer caused by human herpes virus 8?
Kaposi Sacroma
What is the toxicity associated with integrate strand transferase inhibitors?
Hypercholesterolemia
Localized erythema and edema at the site of parasitic entry into the body associated with T. cruzi is called what?
Chagoma
Clinical presentation of a pt who crawled through caves enriched with bird or bat guano and developed progressive disseminated histoplasmosis?
Oral mucosa ulcerations, erythema multiform/nodosum
Adrenal insufficiency
What fungal disease is caused by encapsulated budding yeast associated w/exposure to contaminated soil and dried pigeon stool?
Cryptococcosis
What is the MC first manifestation of Cryptococcosis?
Headache
Scotch-tape test helps diagnose what?
Pinworms (Enterobiasis)
What is the causative agent of Scabies?
Scaroptes scabiei var. hominis
How are respiratory sxs caused by Ascarias?
Ingestion of infectious eggs from fecal contaminated soil, water or vegetables then is carried into the circulation to the lungs resulting in SOB, cough and Loefflers syndrome
What is Loefflers syndrome?
Eosinophilic pneumonia
CD4 count is used to monitor HIV what does it measure?
Measures the status of the immune system and disease progression
- shows risk of opportunistic factors
Viral count is used to monitor HIV what does it measure?
Measures the response to and efficacy of HAART and gives correspond info to the CD4 count
What needs to be done if viral load is >50 after 4 mos of treatment?
Regimen modifications may need to be done
below 50 = undetected stage
What is the MC presentation of cytomegalovirus?
CMV retinitis
What is one other presentation of cytomegalovirus?
CMV Esophagitis
What are s/sx of CMV retinitis?
Unilateral (usually)
- Vision changes, loss of peripheral vision, scotoma, and/or floaters
What are s/sx of CMV esophagitis?
- Chest pain, odynophagia and nausea
- EGD: ulceration in distal esophagus, biopsies to confirm dx
Where is malaria most prevalent?
Sub-Saharan Africa and New Guinea
US: southern states
What topical medication would you use to treat tinea unguium?
- Ciclopirox (nail lacquer)
What systemic medication would you use to treat tinea unguium
- Terbinadine x 3 mos (1st line)
- Itraconazole x 3 mos
What medication would not be used to treat tinea unguium?
Nystatin
What is 1st line tx for SEVERE fungal infections?
Amphotericin B
What necessary steps need to be taken if a pt is having infusion related ASEs with Amphotericin B?
- Reduce infusion rate
- If rigors occurs give Meperidine
What should be done prior to infusions of Amphotericin B to avoid ASEs?
Test dose (required for deoxycholate formulation) - 1 mg IV over 20-30 minutes
Pre-meds 30 minutes prior
- Antipyretics: acetaminophen or NSAIDs
- Antihistamine: diphenhydramine
- Steroids: Hydrocortisone
How is Fluconazole excreted?
Renal
- need to dose adjust
How is Flucytosine excreted?
Renal (>90%)
- need to dose adjust
How is Voriconazole excreted?
Liver
- need to dose adjust
What is a core element for good antibiotic stewardship?
- Effective communication
- Managing pt and family expectation for antibiotic during a clinical visit
ie viral vs bacterial
What is the 1st line tx for Hep C?
Ledipasvir/sofosbuvir x 12 wks
What is an advantage of Hep C tx?
99% curable!
If CD4 count is <200 how would you treat?
Prophylaxis Bactrim PCP (pneumocystis pneumonia)
If CD4 count is <100 how would you treat?
Bactrim prophylaxis TE (toxoplasma gondii encephalitis)
What additional antibiotic therapy would you start in a pt whos CD4 was at 150 but now 50?
Azithromycin/Clarithromycin MAC (mycobacterium avium complex)
A healthcare worker was stuck by a needle how would you treat and for how long?
Tenofovir DF 300mg/Emtricitabine 200mg (Truvada) once daily
PLUS
Raltegravir 400mg BID or Dolutegravir 50 mg qd
x 28 days
What is the treatment for Influenza?
- Oseltamivir (Tamiflu) - dose adjust for renal function
What is 1st line initial tx for HIV infection?
Intergrase Strand Transfer Inhibitor based regimens
-gravir
What is 1st line tx for HBV?
Tenofovir
- monitor for HBV reactivation after d/c
What is the medication regimen for a pt co-infected with HBV + HIV?
Tenofovir \+ Lamivudine (or emtricitaine) \+ Efavirenz
What medications are used to boost therapeutic levels of other antiviral?
Protease inhibitors (ie. Ritonavir)
What is the tx for HSV encephalitis?
Acyclovir
10mg/kg (IBW)/dose IV q 8 hrs x 14-21 days
Primaquine is a medication that is used to manage Malaria, what can it cause?
Hemolytic Anemia in G6PD deficiency
Pt is in the hospital, they have used IV and multi-system resistance Malaria what is the most appropriate combo regimen?
Artemisinin + Lumefantrine
When taking antihelminth drug (ie Praziquantel) what do you want to avoid doing when taking these drugs?
Chewing tablets
- induces retching and vomiting, very bitter
When you take Albendazole for luminal agent what do you want to make sure you do?
Take on empty stomach
When you take Albendazole for systemic agent what do you want to make sure you do?
Take with food to get absorbed
- fatty meal is best
What is first line tx for pinworms?
Pyrantel Pamoate
- only effective for helminths in the GI tract (luminal)
What malaria medication and dose do you take only 1 tablet a week and is good for longer duration?
Mefloquine
- 250mg/wk 1-2wks before/4 wks after
What ASEs do you want to be cautious of when taking Mefloquine?
Neuropsychiatric ASES
- seizures and psych disorders
Malarone is an antimalaria prophylaxis that is made up of what two medications and what dose?
Atovaquone + proguanil
- 100mg-250mg/day 2 days before/7 days after
What malaria prophylaxis is used for mission trips to Haiti and what is the dose?
Chloroquine
- 500mg/wk 1-2wks before/4wks after
What is 1st line tx for HSV and shingles?
Valacyclovir
What is 1st line tx for CMV?
Valganciclovir or Ganciclovir
How would you tx a symptomatic pt who gets entamoeba histolytica?
Metronidazole + Paromomycin (luminal agent)
- combo used when needing to treat luminal infection
How would you treat an asymptomatic pt who gets entamoeba histolytica?
Only need to be treated with luminal agent: paromomycin
How would you treat a pt who is returning in from a trip from India, states he has a “tough GI system did not care about what food or water he consumed” you are concerned about flagellated protozoa how would you treat?
Metronidazole
What causes ASEs of Mebendazole?
Dying helminths may cause inflammation/immunologic/allergic response to proteins released from dying helminths.
How do you avoid the ASEs of antihelminths?
Take in combo with glucocorticoids (prednisone or dexamethasone) to reduce inflammatory response.
- ie: Praziquantel + prednisone to prevent inflammation
What is the dose for Doxycycline for malaria prophylaxis?
100mg/day 2 days before/4 wks after
What is the tx for Toxoplasmosis?
Pyrimethamine + sulfadiazine (w/ folinic acid )
What Biomarker that is usually elevated in systemic bacterial infections but not viral?
Procalcitonin
How is crack cocaine use associated with increased prevalence for HIV infxn?
Cocain for sex bartering
What is amebiasis mode of movement?
Pseudopods
What is Giardias mode of movement?
Flagella
What drug is used to treat influenza resistant to neuraminidase inhibitors?
- Baloxavir Marboxil - out patient labeling
What is the first line treatment of roundworms (AKA ascariasis)?
Albendazole
What is the first line treatment for hookworms (AKA necator americanus)?
Albendazole
What is the first line treatment of lymphatic filariasis?
Diethylcarbamazine
OR
Albendazole + Ivermectin
What is the first line treatment for strongyloidiasis and onchocerciasis?
Ivermectin