The new vaccine has developed and then tested on a large sample of a individuals. this new vaccine will be considered effective if it prepare the body to fight future invasions by

Stimulating the production of antibodies. 

I hope this helps. 

Have a nice day! 

Evaporation: this is when warmth from the sun causes water from oceans, lakes, streams, ice and soils to rise into the air and turn into water vapour (gas). water vapour droplets join together to make clouds! condensation: this is when water vapour in the air cools down and turns back into liquid water.

U whay do you need with?