life expectancy / life spanprenatalinfancychildhoodadolescenceyouthadulthoodphysical developmentsocial developmentemotional developmenthealth statustrendmortalitymedical checkup (or medical screening)a sore
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throat
epidemic
epidemic breakout
to reach epidemic proportions
to diagnose
medical history
deterioration
chronic
to infect
contagious
recover
symptoms
onset of symptoms
preventing something
vaccine
researcher
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