WASHINGTON — 
The World Health Organization hopes to inoculate 5 million children in Yemen against polio this year, while in the United States a movement opposed to the use of vaccines in the very young is gaining momentum, prompting warnings from many doctors that this trend could result in dangerous outbreaks of diseases once under control.
Dr. Peter J. Hotez, an expert in infectious diseases and pediatric care, is among those physicians arguing strenuously against those who oppose vaccines, based on their beliefs that American vaccination practices are putting their children at risk.
FILE – Dr. Peter Hotez, dean of the Baylor College of Tropical Medicine, shows Associated Press journalists areas of Houston’s 5th Ward that may be at high risk for mosquitoes capable of transmitting the Zika virus in Houston.
Pitted against Hotez are groups such as Texans for Vaccine Choice, whose members generally believe that vaccines administered to children may …
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