May 7, 2013 — With the new H7N9 virus spreading through China and H5N1 popping up every now and then in Southeast Asia, it's tough to keep track of all the flu viruses. Here's a quick guide to what those H's and N's mean, and why viruses with these letters cause the most concern.
Feb 21, 2013 — It appears that the current batch of flu vaccine is only about 9 percent effective in protecting people 65 and older against the H3N2 flu strain that's causing the most illness. Even so, health officials still recommend vaccination.
Jan 18, 2013 — According to the latest update from the Centers for Disease Control and Prevention, the number of people age 65 and older who are getting the flu jumped sharply in the last week or so. But even though 48 states are reporting widespread activity, the agency says there are signs the flu may be easing in some parts of the country.
Jan 17, 2013 — Flu viruses hijack the machinery inside animal cells to replicate. The theft is a complicated process that takes time. If the virus leaves the cells too early or too late, the risk of infection falls.
Jan 17, 2013 — Influenza is especially intense this year, and people are flooding into hospitals and doctors' offices. But the flu is just one of a triple whammy of respiratory viruses — plus the nasty norovirus — that are making lots of people sick.
Jan 15, 2013 — As students return to class from winter break, campus health official are trying to avert an outbreak. Colleges in Boston are especially worried after the mayor's declaration last week of a public health emergency in the city.
Jan 15, 2013 — It's still too soon to say whether this is a historically bad flu season. But it's already clear that emergency rooms around the country are filled with feverish throngs that are much larger than during the last flu season.
Jan 11, 2013 — The flu season may be easing up in some parts of the country, but it's far too soon to let you guard down. The Centers for Disease Control and Prevention says influenza infections ebb and flow unpredictably.
Jan 11, 2013 — Across the nation, many Americans are suffering from an outbreak that has hit hard and hit early. Hospitals are jammed and many places are running out of vaccine. The flu's already been blamed for the deaths of at least 20 children.
Jan 8, 2013 — Vaccination is still the best way to avoid getting sick, but it's not 100 percent protective. Some people may get infected with a strain of flu that isn't covered by this year's vaccine. For others, the shots just don't work.