Vaccine- are a little bit of the virus that is dead so your body can make antibodies that can fight off the virus.
Zinc Sulphate- a medicine
Formally improved -Approved from the Government
Medical Benefit- Helping your body fight.
Undoubtedly- probably, definitely
Spray inhalers - a gas you breathe in through your nose/mouth, think of an asthma inhaler.
benefit/beneficial - mean the same thing
Hope - In those days they didn’t have any vaccine, Vaccine is something that makes antibodies and can fight off the virus/flu. Zinc sulphate gas is a medicine which they thought would get rid of the virus/flu. A few years later they found out that the spray inhalers didn’t do anything because they were all crowded together in the same room and that made it worse. Later on when the war finished everyone was excited and they were all together again and celebrating. That way the flu spread more and that caused more deaths.
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