Category Archives: Public Health

Social networks and epidemics

Simple SIR models essentially assume that the infection rate of any  population is homogeneous, i.e. everyone stands an equal chance of getting infected. However this isn’t really true, because some people have very large social networks, while  the majority vary … Continue reading

Posted in Public Health | 17 Comments

Herd Immunity

Note: My definition of Herd Immunity is the total % of the population who get infected once the epidemic has completely finished. Most people define it as just the % of the population infected once  the peak is reached. This … Continue reading

Posted in Public Health, Uncategorized | 16 Comments

The R value

We constantly hear at the UK daily Covid press conferences that we must keep R <1 to avoid a second wave of infections. Prof. Chris Witty warns us that if R goes above 1 then we will see an “exponential” … Continue reading

Posted in Public Health | 13 Comments