Many primary care doctors may not be up to speed on the causes and best treatments for allergies, a new study suggests.

In a survey of over 400 internists and pediatricians, researchers found that misconceptions about allergies were fairly common -- particularly when it came to food allergies.

For example, one-third of all doctors, and half of internists, did not know the go-to treatment for a person who develops hives and vomiting after eating a known food allergen. (It's an injection of epinephrine.)

There were also false beliefs about some of the causes and consequences of allergies. Most internists -- 85 percent -- thought people with egg allergies cannot receive the flu vaccine, the findings showed. And only 27 percent of pediatricians knew that milk and eggs are the most common causes of food allergies in children younger than 4.

Instead, pediatricians more often cited strawberries -- which don't even make the list of the eight most common food allergens, said Dr. Neeta Ogden, a spokesperson for the American College of Allergy, Asthma and Immunology (ACAAI).

"It's concerning that many pediatricians don't have the most common food allergens on their radar," said Ogden, who was not involved in the study.

Dr. David Stukus, the senior researcher on the work, agreed. "This points to some key areas where there's a need for more education," said Stukus, an allergy specialist at Nationwide Children's Hospital in Columbus, Ohio.

But the findings, to be presented Friday at the ACAAI's annual meeting in Atlanta, did not come as a surprise to Stukus.

"When we designed the study, we were aiming to confirm some suspicions we'd had," he said.

And to an extent, Stukus noted, it's understandable that primary care doctors would lack some allergy knowledge, since they can't be experts in all specialties.

But, he and Ogden pointed out, there are some basics that general practitioners should know -- such as the fact that people with egg allergies can get the flu shot. (Some flu vaccines are manufactured using chicken eggs, and may contain tiny bits of egg protein. But people with egg allergies can safely receive the shot, according to the ACAAI.)

With something as "vital" as flu vaccination, Ogden said, it's important that doctors are better-informed.