'In the late 1950s the Asian type of this virus caused 70,000 deaths in the U.S.; the Hong Kong strain struck in the '60s'
influenza
I DOCTOR: In the late 1950s the Asian type of this virus caused 70,000 deaths in the U.S.; the Hong Kong strain struck in the '60s
In the late 1950s the Asian type of this virus caused 70,000 deaths in the U.S.; the Hong Kong strain struck in the '60s
In the late 1950s the Asian type of this virus caused 70,000 deaths in the U.S.; the Hong Kong strain struck in the '60s
"I" DOCTOR
influenza
"I" DOCTOR