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spread to be spread spreading to spread
more dangerous mild fatal spreading more fast.
notorious "shape shifters". has been very stable. has mutated rapidly. has exchanged genes with other viruses.
spread spreads travel travels
through hand - to - hand contact. through the air. through skin contact. through coughin
According to the study of researchers in the Netherlands, H1N1 viruses are transmitted through hand - to - hand contact. through the air. through skin contact. through coughing.
calls to call calling called
keep up with put up with look up to come up with
greatly necessarily fully nearly
picked up took up brought up caught up
（H1N1）flu.A.What Where Why How
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