H3N2
Seasonal flu variant
H3N2 is a subtype of influenza A virus, identified by proteins on its surface: hemagglutinin type 3 and neuraminidase type 2.
It circulates seasonally in humans and is a common component of annual flu vaccines.
H3N2 strains tend to cause more severe illness than H1N1, particularly in the elderly.
The subtype also infects pigs and birds.
Acute viral respiratory infection
- subtypeSmaller group within larger
- strainExcessive stretching force
- mutationPermanent DNA alteration
- reassortmentViral segment exchange
virus · pathogen · envelope · glycoprotein · replication · host cell · viral shedding · incubation
Sudden eruption of trouble
- epidemicWidespread disease occurrence
- pandemicGlobal disease outbreak
- seasonal fluAnnual viral respiratory illness
- surveillanceSystematic observation of subjects
CDC · WHO · morbidity · mortality · spread · infection rate · hotspot · cluster
Disease prevention injection
- flu shotYearly illness prevention injection
- immunizationProtective medical injection
- boosterSomething that increases strength
- antibodiesProteins targeting pathogens
immunity · herd immunity · hand washing · mask · hygiene · disinfection · social distancing · Tamiflu
1968 influenza pandemic
- historical outbreaksPast disease emergencies
- global spreadExpansion across all nations
- evolutionSpecies changing over generations
Elevated body temperature
- coughExplosive airway clearing
- chillsShivering spells from illness
- fatigueWeariness from prolonged exertion
- body achesDiffuse muscular soreness
headache · sore throat · congestion · runny nose · malaise · sweating · weakness · respiratory
influenza
Acute viral respiratory infection
reassortment · virus · pathogen · envelope · glycoprotein · replication · host cell · viral shedding · incubation · contagion
outbreak
Sudden eruption of trouble
- epidemicWidespread disease occurrence
- pandemicGlobal disease outbreak
- seasonal fluAnnual viral respiratory illness
surveillance · CDC · WHO · morbidity · mortality · spread · infection rate · hotspot · cluster · contact tracing
vaccine
Disease prevention injection
- flu shotYearly illness prevention injection
- immunizationProtective medical injection
- boosterSomething that increases strength
antibodies · immunity · herd immunity · hand washing · mask · hygiene · disinfection · social distancing · Tamiflu · antiviral
Hong Kong flu
1968 influenza pandemic
- historical outbreaksPast disease emergencies
- global spreadExpansion across all nations
- evolutionSpecies changing over generations
fever
Elevated body temperature
- coughExplosive airway clearing
- chillsShivering spells from illness
- fatigueWeariness from prolonged exertion
body aches · headache · sore throat · congestion · runny nose · malaise · sweating · weakness · respiratory · pneumonia
Illness from harmful microorganisms
E. coli · MRSA · tuberculosis · fungal infection · parasitic infection