Conjugated Vaccines - CORRECT ANSWER-Vaccine contains sugars purified from
bacterial surfaces combined with a carrier molecule
PROS:
-safe--no chance of infection
-children < 18 months of age generally have a poor immune response to sugars
-combining the sugars with a carrier molecule induces a better immune response
Polio - CORRECT ANSWER--caused by poliovirus
-poliovirus is transmitted by food, water, contaminated hands, and fomites via the
fecal-oral route
-95-98% of polio cases are subclinical or cause "flu-like" illness
- mild cases or subclinical carriers shed poliovirus
, - difficult to trace outbreaks to their sources
-2-5% of polio cases involve the nervous system and become paralytic
-can cause limb paralysis or respiratory paralysis
What is Polio? - CORRECT ANSWER--under poor sanitary & hygienic conditions,
exposure to poliovirus usually occurs during infancy, infants develop mild infections
due to partial immunity acquired from their mothers, and develop immunity
-before modern sanitation and hygienic, paralytic polio was very rare
-Polio increased in frequency and severity during the early 20th center due to
modern sanitation & hygiene
-exposure began to occur during childhood (or young adulthood) when paralytic
polio is more likely to occur
-immunity from mother is gone by childhood
-Polio outbreaks occurred frequently from 1916-early 1950s
-25-50% of polio survivors from 1950s epidemics suffer today from post-polio
syndrome: progressive muscle deterioration
-1954: Salk Vaccine (IPV, inactivated whole agent vaccine)
-1963: Sabin oral vaccine (OPV, attenuated whole agent vaccine)
-Polio considered "eliminated" in Western hemisphere & in developed countries
-Targeted for eradication worldwide (outbreaks still occur in several areas)
Sexually Transmitted Infections - CORRECT ANSWER--STI agents require
environmental conditions found inside the body (intimate contact required for
transmission, can be spread by all types of sexual contact)
-Infection with most STI agents does not lead to immunity
-Often there are no symptoms: people don't realize they are infected
-STI's increase the risk of becoming infected w/ HIV
STI Prevention - CORRECT ANSWER--Abstinence (prevents all)
-Monogamy with uninfected monogamous partner (prevents all)
-Condoms (prevents some)
-Medical checkups/tests for sexually active people (symptoms or not) [all sexual
partners should be notified if a test is positive]
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