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Health experts say Americans shouldn't be overly concerned

FRIDAY, Feb. 10 (HealthDay News) -- It was just about three years ago that a strange new strain of flu first appeared in Mexico, then spread across the border to the United States and eventually much of the globe.
The H1N1 "swine" flu strain didn't behave like a "normal" flu, because it proved particularly dangerous to children and younger adults -- the very groups of people who usually have the strongest defenses against seasonal flu.
After a quiet couple of years, more cases of the pandemic H1N1 flu are circulating again where it all began -- in Mexico.
But infectious disease experts says Americans shouldn't be overly concerned.
In January, there were 1,623 cases of flu reported in Mexico, and 90 percent of those cases were H1N1 flu. There were also 32 flu-related deaths, all but three caused by the H1N1 strain, the Associated Press reported.
"It appears that H1N1 in Mexico is circulating at a higher level than in the United States," said Tom Skinner, a spokesman for the U.S. Centers for Disease Control and Prevention. "We have seen some H1N1 here in the U.S.," he added, but the more familiar H3N2 strain is predominating here this winter.