Week 9 Flashcards
what are the foundational concepts of communicable diseases (7)
- infections
- epidemiological triangle
- classification of communicable diseases
- types of transmission
- lvls of prevention
- prophylaxis
- PHNs role
define: infection
- the invasion and multiplication of microorganisms in body tissues, which may be cliically unapparent or result in local cellular injury due to competitive metabolism, toxins, intracellular replication, or antigen-antibody response
infection is caused by… (5)
- bacteria
- viruses
- fungi
- parasites
- protozoa
common pathogens (just review)
what is typically involved in tx for viruses
- treat symptoms
- sometimes antivirals or immunization
define acute
- resolving in a few days or weeks
- very ill
define chronic
- lasting >12 weeks
- may be incurable
- may become a carrier
- can develop from acute
define: localized
- limited to a specific body area
define: disseminated
- spread to other parts of body
ex. syphilis
define: systemic
- spread throughout the body
define: sepsis
- pathogens throughout blood and tissues
what is the difference between primary and secondary infection
- different stages
what are examples of hospital acquired infection (3)
- pneumonia
- MRSA (both hospital and community)
- Cdiff
what is an example of a community acquired infection
- pneumonia
what are some examples of infections that are antibiotic resistant
- TB
- some types of STI
what contributes to antibiotic resistance
- not completing full dose of abx
antibiotic resistance leads to… (2)
- longer treatment
- different treatment
interaction of host, pathogen, and enviro
interaction of host, pathogen, and enviro
what host behaviors reduce the risk of infection (6)
- hand hygeine
- condoms
- intact skin
- good health
- avoid contact
- immunization
what is an environmental change that reduces the risk of infection (4)
- monitoring air quality
- water supply
- sanitation
- weather (winter v summer)
describe the epidemiological trainge
- for an infectious disease to be acquired, 3 elements are needed:
–> an infective agent
–> a susceptible host
–> a supportive enviro
the epidemiological triangle is a simple way to classify…
- communicable disease by examining the relationship between the host, agent, and enviro
to disrupt the epidemiological triange, we disrupt…
- the interaction between host, enviro, and pathogen
define herd immunity
- we want 95% of population immunized to achieve herd immunity
- for the group, not the individual
localized outbreaks can be the result of…
- low herd immunity
what is included in assessment r/t infection (4)
- history of present illness (when did it start)
- symptoms (when, what, who)
- examination (physical, observation, mostly self report)
- diagnostics
what kind of diagnostics are used w infection (3)
- lab (CBC, elevated WBC)
- C&S (throat, genital, mucus membranes
- radiological for TB (sputum, CXR)
what are examples of ways to classify communicable diseases (5)
- clinical presentation
- the microbe causing it
- how its transmitted
- the reservoir
- public health classification
what are examples of diseases classified based on clinical symptoms (5)
- diarrheal
- resp
- central nervous
- cvs
- sepsis
what are examples of diseases classified based on microbiologic classification (5)
- bacterial
- viral
- fungal
- parasitic
- prion
what are examples of diseases classified based on means of trasmission classification (5)
- contact
- food or water bprne
- vector borne
- perinatal
- airborne
what are examples of diseases classified based on reservoir in nature classification (4)
- human
- animals (zoonones)
- soil
- water
what are examples of diseases classified based on public health programs (5)
- vaccine preventable
- resp
- enteric, food borne, water borne
- sexually transmitted and blood borne
- zoonotic and vector borne
describe: zoonotic transmission
- transmissable between humans & animals
what are examples of zoonotic infections (6)
- ebola
- rabies
- ecoli
- avian flu
- bovine TB
- BSE/CJ
describe vector borne infections
- caused by viruses, bacteria, and parasites that arthropods carry and pass on
what are examples of vector borne infections
- lyme disease and RMSF
- malaria
- west nile
describe enteric infections
- enters the body thru the mouth and GI tract
- consumption of contaminated food
what are examples of enteric infections
- salmonellosis
- ecoli
- glardiasis (beaver fever)
- hep A
describe respiratory infections
- often caused by viruses, sometimes bacteria
what are examples of resp infections (6)
- pneumococcal pneumonmia (droplet)
- chicken pox
- group A strep (large droplet)
- pulmonary TB
- measles
- influenza
describe fomite infections
- caused by used tissues
- doorhandles
- atm buttons
- debit machines
describe sexual infections
- enter thru penis, vagina, mouth, anus (ie. mucus membranes)
- also vertical transmission
- consider transmission to babies
what are examples of sexually transmitted infections (5)
- chylamydia
- syphilis
- gonorrhea
- HIV
- hep B
describe blood borne infections
- thru infected blood
- injection drug use
- vertical transmission
- think of transmission to babies
what are examples of blood borne transmitted infections
- hep C
- HIV
describe healthcare and iatrogenic infections
- result of being admitted to or attending a healthcare facility
what is an example of a healthcare or iatrogenic infection
- c diff
what is one of the most highly communicable diseases? what else is?
- most highly = measles
- also fomite
what are lvls of prevention for infection (4)
- premordial
- primary
- secondary
- tertiary
what is the focus of primordial prevention
- health promotion
- high lvl interventions that effect everyone
what is an example of primordial prevention
- safe water supply
- water water screning
- swabbing floors for evidence of covid
what is the focus of primary prevention
- prevent diseases
- requirement for individual to do something
what are examples of primary prevention (8)
- immunization
- handwashing
- standard precautions
- PPE
- notifying contacts
- pre-exposure prophylaxis prep
- infection control (ex. cleaning services, sharps)
- public education
what is the focus of secondary prevention
- detect disease so we can diagnose and treat
what are examples of secondary prevention (7
(C:) how are outbreaks of hep a and meningitis managed
- screening and testing (who is at risk, often done when foodborne)
- case finding
- isolation (infected)
- quarantine (well but (possibly) exposed)
- prophylaxis (passive = immunoglobulin, and active = vaccines)
- hep A outbreak = hep A antibiotics
-meningococcal outbreak = all in contact get cipro
what is the focus of tertiary prevention
- reduce severity and illness and complications
what are examples of tertiary prevention
- directly observed therapy (ex. TB)
define: prophylaxis
- action taken to prevent disease, especially by specified means or against a specified disease
what are examples of prophylaxis (2)
- antibiotics prior to dental work
- HIV: pre-exposure prophylaxis
describe pre-exposure prophylaxis for HIV
- using certain antiretroviral medications by HIV uninfected persons who are at high, ongoing risk of HIV acquisition, beginning before and continuing after potential HIV exposure
describe prophylaxis post-exposure
- when you have been exposed (or potentially exposure) to an antigen
what are examples of times when prophylaxis post-exposure is used(3)
- HIV postexposure
- hep A postexposure
- after needlestick
what is involved in post-exposure needlestick prophylaxis
- wash location
- post-exposure protocol –> history, take med, serology, blooddraw from other individual
describe HIV postexposure prophylaxis
- involves 28 days of antiretroviral medications immediately after a specific HIV exposure
describe hep A postexposure prophylaxis
- involves hep A vaccine or immune globulin (IG) to prevent infection
- administered within 2 weeks of exposure
what are guiding principles for STBBIs (6)
- diversity
- cultural safety
- health equity
- population health approach
- harm reduction approach
- evidence informed and use of best practices
when diagnosing syphilis, what should you look for? (3)
- chancres on the genitals, anus, and mouth
- serology
- dacron-tipped, rayon-tipped, and/or flocked swab of the genital or extra genital lesions to cadham provincial labratory in viral transport medium
what is the preferred treatment for syphilis
- bicillin LA
with syphilis, you should be aware of… (2)
- symptoms of secondary and tertiary syphilis
- symptoms of complications
When should sexual contacts of known syphilis cases be treated
- treated immediately for syphilis without waiting for test rests
due to primarily heterosexual outbreaks in the north, who should be tested?
- test pregnant pts who reside in the northern health region at:
–> first prenatal visit
–> 28-32 weeks
–> again on delivery
regardless of location of residence, test pregnant pts…
- more frequently for syphilis if risk for infection is identified
the re-emergence of syphilis is due to…
- drug resistance
describe congenital syphilus
- as the baby is born, it can get infected
what are risks associated with congenital syphilus (4)
- neuro consequences
- blindness
- deafness
- problems w learning
can the infection be cleared w congenital syphilis
- yes, but damage can already by done
50% of cases of congenital syphilis had..
- no prenatal care
what organism causes syphilis
- treponema pallidum
what is transmission of syphilis
- direct contact w syphilitic sore
what is the incubation period of syphilis
21 days average
what are complications of syphilis
- neuro complications
when is screening for syphilis done
- people w risk factors
what are diagnostics for syphilis
- serology
what is included in treatment for syphilis
- antibiotics
what is included in followup for syphilis
- post treatment serologic testing at intervals
describe partner notification w syphilis, trace back period depends on…
- test & treat sexual or perinatal contacts
- trace back period depends on the stage of infection of the index case
what are symptoms of syphilis (8)
- fever
- swollen lymph nodes
- sore throat
- patchy hair loss
- headaches
- weight loss
- muscle aches
- fatigue
what is included in prevention of syphilis (5)
- safer sex
- rigorous contact tracing of infectious cases
- screening of high-risk groups
- routine blood test w STI screen and during pregnancy and on immigration
- local outreach to MSM via bathhouse clinics, park outreach, internet outreach, GLBT health coalition
what are examples of high risk groups for syphilis (4)
- if have other STI
- multiple contacts
- pregnant women
- gay men
is syphilis curable
- yes
the # of new HIV cases per year in Manitoba increased by __% between 2014 to 2016
25%
among transmission events occurring Manitoba for HIV, the most commonly reported risk activity is…
- heterosexual sex
an estimated __% of Canadians who have HIV do not know it
21%
if you do not know the HIV status of the pt in front of you, what do you do?
- offer testing –> risk based screening is not recommended
the manitoba HIV program has endorsed…
- the BC testing guidelines which include recommended testing frequency
describe prevention of HIV
- still do not know alot about how to prevent it (many people know that they have it)
what are examples of ways to prevent HIV (6)
- condoms
- lube
- HIV tx
- PrEP
- PEP
- not sex sharing toys
- choosing oral sex, masturbation and forms of sexual stimulation that pose little or no risk of HIV
what is universal HIV testing
- bloodwork
describe condom and use for prevention of HIV
- use a new condom every time you have sex
- use only water or silicone based labricants –> oil based can make a condom break
if a person has HIV and is not on HIV treatment, what should they do?
- talk to their doctor about starting HIV treatment
what is the purpose of HIV treatment (3)
- not a cure
- protect your health
- prevent HIV transmission –> when a person is on HIV treatment and have suppressed viral load, they do not pass HIV during sex
what might make you a candidate for HIV PrEP
- if you are HIV negative and at higher risk for HIV
HIV PrEP involves…
- an HIV negative person taking certain HIV drugs to reduce the risk of getting HIV
when does a person start HIV PrEP
- before being exposed to HIV
what might make you a candidate for HIV PEP
- if you are HIV negative and may have been exposed to HIV
when should you start PEP? how long is it taken for?
- asap after being exposed –> within 72 hrs of exposure
- taken for 28 days
what is the transmission of AIDS (4)
the exchange of a variety of body fluids from infected people, such as:
- blood
- breast milk
- semen
- vaginal secretions
what is the incubation period of AIDS
1-3 months for it to be visible on tests
complications from AIDS depend on…
- progression
who should receive screening for AIDS (7)
- anyone requesting
- anyone w symptoms or signs
- individuals w illnesses associated weakned immune system
- shared drug equipment
- unprotected intercourse
- pregnant or planning pregnancy
- victim of sexual assault
what diagnostics are used for AIDS
- rapid hiv test kits
describe gonorrhea rates in males vs females
- both are affected
- but over the last 5 years, rates have been consistently higher in females
what are testing tips for gonorrhea
- in addition to testing genitals through urine or swabs, also consider taking throat and anal swabs using a red or black topped culture tubeb
how is gonorrhea treated (2)
- cephalosporin
- azithromycin
what should be avoided when taking azithromycin
- monotherapy
what organism causes chlamydia
- chlamydia trachomatis