Scientists discover the travel patterns of seasonal flu - findings may lead to improved flu vaccines.

In parts of the United States, influenza is peaking, and while this year's vaccine isn't as effective as usual, the flu's misery can be avoided.

Influenza is a viral infection that affects millions of people each year and potentially can cause serious complications, especially in children and older adults.

Merck says it voluntarily recalls Hib vaccine due to contamination in the equipment in which the vaccine is made. Merck Hib vaccine recall includes around 1.2 million doses.

Move on mosquitoes. Step aside sweat bees. Before long, another unwelcome, but predictable, pest will return: the dreaded, oft-spotted flu bug.

An experimental flu vaccine made in insect cells - not in eggs, where flu vaccines currently available in the United States are grown - is safe and as effective as conventional vaccines in protecting people against the flu, according to results published in the April 11 issue of the Journal of the American Medical Association.