VOA News: ‘Silent’ Polio Cases Could Reignite Epidemics, Study Warns
“Only a few hundred cases of paralytic polio still exist worldwide, thanks to massive vaccination campaigns. But a new study concludes that so-called silent cases of polio can infect populations for years, threatening to reignite disease epidemics. … Writing in the journal PLoS Biology, researchers from the University of Michigan say continued surveillance is necessary because these silent infections can spark a resurgence of active polio…” (Berman, 6/19).