As a Food and Drug Advisory committee debates Friday whether to approve booster shots of the COVID-19 vaccine, health officials in New Hampshire said the science is uncertain whether a third shot is needed.Data shows that the vaccines are safe and effective against COVID-19, including the delta variant. Government officials are considering whether to approve a third shot of the Pfizer vaccine, the only vaccine that has full approval for use in people age 16 and older."If you read the literature and you read the news and take all the facts, it's not a slam dunk," said Will Owen, head of emergency management at Memorial Hospital.Owen said it's possible that regulators will approve a booster for certain groups."It may be anyone over the age of 60. It may be over the age of 60 and health care workers," he said. "We don't know."There have also been questions about whether it makes sense to start planning for a booster shot, when so much of the state remains unvaccinated. Owen said Memorial Hospital is continuing to push people to get vaccinated."We have the resources and inventory right now to continue to do that, along with the booster shot," he said.Even if the FDA committee grants approval, Owen said there are more steps to go through, including a sign-off by the Centers for Disease Control and Prevention. If approval ultimately happens, Owen said people should not be worried if their booster shots are scheduled outside the recommended time."It doesn't mean that all of a sudden, your vaccine is ineffective and isn't going to work," he said. "This is not nearly as urgent or as important as getting that first dose."Even if all the federal agencies sign off on booster shots, Owen said Memorial Hospital will wait for the state to issue its guidelines before workers start putting shots in people's arms.