MEXICO CITY — Mexican officials, scrambling to control a swine flu outbreak that has killed as many as 61 people and infected possibly hundreds more in recent weeks, closed museums and shuttered schools for millions of students in and around the capital on Friday, and urged people with flu symptoms to stay home from work.
Because of the situation, the WHO planned to consider raising the world pandemic flu alert to 4 from 3. Such a high level of alert — meaning that sustained human-to-human transmission of a new virus has been detected — has not been reached in recent years, even with the H5N1 avian flu circulating in Asia and Egypt, and would “really raise the hackles of everyone around the world,” said Dr. Robert G. Webster, a flu virus expert at St. Jude Children’s Research Hospital in Memphis.
Despite the alarm in recent years over the H5N1 avian flu, which is still circulating in China, Indonesia, Egypt and elsewhere, some flu experts argued that it would never cause a pandemic, because no H5 strain ever had. All previous pandemics have been caused by H1s, H2s or H3s.
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