Previous analysis of potential post-lockdown university class lengths suggests a larger number of shorter lectures (3 x 40mins vs 1 x 2 hours) may reduce the risk of airborne Covid-19 transmission. However, if cross-class contamination is taken into account this short-class advantage is reduced or reversed and furthermore may lead to infection patterns that are harder to control. This adds to other reasons why fewer longer classes may be preferable.
Keywords: Covid-19, coronavirus, university return, mathematical modelling, airborne transmission
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