Maciej Boni of Pennsylvania State University said: “Unchecked, infectious outbreaks typically stabilize and then begin to decline when the disease runs out of available hosts.
Maciej Boni wa Chuo Kikuu cha Penn State alisema, &quot;Zisipofuatiliwa, kuzuka kwa maambukizi kwa kawaida huendelea kisha huanza kupungua wakati ugonjwa inaishiwa watu wa kuambukizwa.