Swiss cheese model explains why multiple measures needed to fight Covid-19

By Dr MILTON LUM

Face masks need to be worn correctly, consistently and by enough people, to be effective in helping to prevent viral spread. — SS Kanesan/The Star

There is no single measure that is 100% effective in preventing the spread of the SARS-CoV-2 virus that causes Covid-19.

Measures other than vaccination are needed against Covid-19.

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