SAM MEDNICK  HEALTH worker Estelle Sanon looked on helplessly as a woman tried to make her squirming baby drink a mug of malaria medicine outside their house in Burkina Faso's capital Ouagadougou. Normally Sanon would hold the 18-month-old and administer the dose herself, but because of coronavirus, she has to keep a distance from her patients. "If I am standing and watching the mother do it, it's as if I'm not doing my work," said Sanon, a community health volunteer assisting in a seasonal campaign to protect children in the West African country from the deadly mosquito-borne disease. Burkina Faso…