Polio can still be a threat

Nov. 8, 2011 at 7:32 PM
1 of 4
| License Photo

TEL AVIV, Israel, Nov. 8 (UPI) -- Although health officials are close to eradicating polio, an Israeli researcher says there are ways it can still be a threat.

Dr. Lester Shulman of Tel Aviv University's Sackler Faculty of Medicine and the Israeli Ministry of Health said he spent years tracking isolated cases of live poliovirus infections, often discovered in countries that are supposedly polio-free.

Cases pop up because the live-virus version of the vaccine -- Oral Polio Vaccine -- evolves and can act like wild poliovirus, continuing the threat of contagion. Over time, the vaccine can mutate, and even a 1 percent genomic change permits the virus to behave like a wild poliovirus and if a population isn't sufficiently immunized, the disease can spread, Shulman said.

Shulman recommends public health agencies:

-- Maintain "herd immunity," a 95 percent immunization rate for polio to prevent the spread of wild and evolved vaccine strains of the virus.

-- Maintain environmental surveillance of sewage systems.

-- Switch to Inactivated Polio Vaccine instead of Oral Polio Vaccine.

Shulman's research was recently published in PLoS ONE.

Related UPI Stories
Latest Headlines
Trending Stories
Females with childhood ADHD at double the risk for obesity
Medicaid-paid births up in Texas since defunding Planned Parenthood
New ethics standards for DNA replacement therapies
New screening method detects all cystic fibrosis mutations
Esophageal cooling device helps doctors control body temperature