In our series of letters from African journalists, Kenyan Joseph Warungu looks at the acts of generosity helping ordinary people through desperately trying times.

When Covid-19 hit Africa, the effects were devastating - but some people have been crushed more than others, by the illness but also by the measures to deal with it.

Private-school teachers, who make up a significant amount of the education workforce, have been particularly hard hit by school closures as they have no safety net and in most cases no firm return date either.