The current recommendation is based on unique conditions associated with the existing pandemic, including low levels of population immunity to 2009 H1N1, the potential for health-care personnel to be exposed to H1N1 patients, and other factors, Dimond says.

CNN: STORY HIGHLIGHTS

Yea, that study that actually tested all other conceivable factors, performed a detailed analysis, replicated the analysis among multiple populations and proved conclusively that herd immunity can be conferred in the population if 95% of it is vaccinated.

FORBES: Anti-Vaccine Movement Causes The Worst Whooping Cough Epidemic In 70 Years

Immunity to dengue is low in Singapore's population because of the intensive dengue-carrier controls, "making the population vulnerable to outbreaks, " said Ng Lee Ching, director of the Environmental Health Institute at Singapore's National Environment Agency.

WSJ: Dengue Fever on the Rise in Singapore

All immunisation is intended to benefit the wider population as well as the individual through what is known as herd immunity.

BBC: Flu vaccines for all children