Fungal and Viral Infections Flashcards
General Info on mycobacteria
causes typical/atypical illnesses, acute and chronic
LIFECYCLE
- slow growth, special cell wall with infections protected in tubercles (reason why one of them is called tuberculosis)
Typical mycobacteria infections: Mycobacterium tuberculosis (TB) and Mycobacterium leprae (leprosy)
Atypical: M. scrofulaceum (Scrofula); M. kansaii and M. marinum (skin infections); M. avium-intracellulare in immuno-compromised hosts (AIDS COPD)
what is it when a child is infected with TB?
TB in community, is a sentinel event
how is TB transmitted
airborne (lab culture takes weeks so acid-fast stains of sputum and skin testing and image CXR)
What are the two types of TB?
- Latent: positive skin test, not progressed to illness and is treated due to “sero-conversion”
- Active: esp in immuno, a child, HIV
a) pulmonary: coughing, night sweats, weight loss, hemoptysis
b_ miliary: other parts of body
what are the bactericidal drugs to treat TB?
- isoniazid (INH): AEs include peripheral neuropathy (prevent with vitamin B6 pyridoxine 5–100 mg/day); hepatotoxic -> monitor LFTs
- rifamycins (Rifampin, RIF and Rifapentin, Priftin): adjunct, AEs include urine/sweat, turning read, hepatotoxic, flu-like symptoms of myalgia headahce n/v
- drug interaction with CYP P450 enzymes may increase clearance clearance of oral contraceptives making them less effective
- rifabutin (Mycobutin): oral drug, synthetic agent better against M.avium
- pyrazinamide (PZA): adjunct when resistance issue; AEs of hepatotoxic, hyperuricemia, and gouty arthritis
- streptomycin: doesn’t penetrate CSF (can’t treat CNS TB) IM drug
- nephrotoxic, ototoxic (vestibular toxic)
- capreomycin: similar to streptomycin; IM drug
bacteriostatic drugs to treat TB
- static=slow down so typically used in combo
1. para-aminosalicylic acid (PAS, aminosalicylic acid) oral drug; Aes of mono-like syndrome, GI intolerance
2. ethambutol (Myambutol): oral drug, AEs retrobulbar neuritis, loss of central vision; must have baseline opthalmic exam to establish baseline before starting drug
Other drugs with anti-TB effects
- aminoglycosides: kanamycin, amikacin (renal/ototoxic)
2. fluro-quinolones: levofloxacin, moxifloxacin
What’s the treatment protocols for latent TB infections (LTBIs)?
INH x 9 months or RIF x 4 months
What’s the treatment protocol for resistant infections?
- daily treatment no lapses or resistance
- DOT: direct observation of treatment for 1st week
- combo therapy
- at least one bactericidal
- sensitivity testing checks for MDRTB or multi-drug resistant TB
if someone has TB, what’s important information for them?
referall to health department; provide lab monitoring, xrays, usually free drugs, this is nurse managed
Older and newer drugs for leprosy
older: many aes, renal, gi, rashes
1. injectable dapsone (IM acedapsone)
2. oral dapsone
3. clofazimine (Lamprene)
newer
1. thalidomide (Thalomid)
- originally anxiolytic, can cause birth defects
AEs: teratogencity, periph neurop, rash, hypothyroid, neutropenia, fever, increased HIV-RNA levels
mycobacterium avium overview
- in immuno not healthy; sometimes called opportunistic infection
- multi-drug: fluroquinolones, macrolide, and usual mycobacterium drugs
antifungal drugs
also called anti-mycotic
1. Azoles (imidazoles and triazoles)
- poss heart failure/liver
- lots of drug-drugs
SYSTEMIC: fluconazole (Diflucan), ketoconazole (Nizoral), itraconazole (Sporanox), voriconazole (Vfend), posaconazole (Noxafil)
TOPICAL: clotrimazole (Lotrimin, Mycelex), miconazole (Micatin), ketoconazole (Nizoral shampoo), econazole (Spectazole), oxiconizole (Oxistat), sulconizole (Exelderm solution)
- polyenes: amphotericin B (Fungizone, also a macrolide antibiotic); Nystatin (Mycostatin, Nystatin, Nilstat)
- allylamines: neutropenia, liver, SJS, less drug-drugs
- naftate (Naftin cream), terbinafine (Lamisil, cream/oral/spray) - potassium iodide: older drug, no longer used
- flucytosine (Ancoben): severe mycoses/fungal infections
- griseovulvin (Gris-Peg, Fulvicin)
- older, longterm to work
- take with fatty food
- teratogenic
Non-pharmacologic measure in fungal infections
- education to prevent recurrence
- fungi keep ventilated/dry
- avoid trauma/lifestyle factors
- use clean, dry white
- manage underlying conditions (ex DM hyperglycemia) - surgical removal of the nail in onychomycosis
- nail hygiene (for onychomycosis):
- nails clean and short
- clip tonails straight, file
- avoid high heels, narrow-toed shoes
- - avoid community nail stuff
- acoid barefoot/clean dry
- discard old shoes, sprary with antifungal sprary periodically
which gloves are use for dry manual work and which for wet?
- cotton - dry
2. vinyl - wet
what are topical anti-fungals used for?
- yeast infections (Candidiasis, tinea versicolor) and ringworm
what are the topical imidazoles
- clotrimazole (Lotrimin, Mycelex), miconazole (Micatin), ketoconazole (Nizoral), econazole (Spectazole), oxiconizole (Oxistat), sulconizole (Exelderm), sertaconazole (Ertaczo)
- combo therapy: corticosteroi + antifungal (ex Lotrisone, + clotrimazole) for fungal and inflammaiton
- OTCs: miconazole 2% (Lotrimin AF), clotrimazole 1% (Lotrimin AF cream) Butenafine 1% (Lotrimin Ultra)
- RX: terbinafine (Lamisil AT)
what are the topical anti-fungals for fungal/mucosal skin infections
- topic imidazoles
- topical allylamines: naftifine (Naftin, terbinfaine (Lamisil, spray)
- topical polyenes: nystatin (Mycostatin, Nystatin), amphotericin B (Fungizone)
- topical hydroxypiridone: ciclopirox (Loprox cream and Penlac nail lacquer)
- topical naphthiomate: tolnaftate (Tinactin)
what is pityriasis
tinea versicolor; involves lare SA and treated with terfinadine spray (Lamisil spray of 1% solution)
what is seborrhic dermatitis
on scalp
- often fungal infection
1. Nizoral (ketoconazole) shampoo to treat underlying Pitysporum
2. Xologel 2% (ketoconazole) get once daily
what represents 50% of all nail disorders
onychomycosis (Nail fungus)
treatments for onychomycosis
- Topical: must do filing/clipping so will penetrate nail; Penlac Nail Lacquer (8% cicloprox olamine) daily
- long-term systemic: potentially toxic, older drugs (griseofulvin, Gris-Pet; ketoconazole, Nizoral)
- short-term systemic (commonly used): off-lael fluconazole (Diflucan); label itraconazole (Sporanox); terbinafine (Lamisil)
- time length of drugs varies and if treating toe or fingernail
- Aes: heart failure, liver, rash
what do 2/3 of infants gets
diaper dermatitis (rash); though diapers with increased absorbency have reduced incidences; breast-fed infants have less diaper rash