The outbreak of swine flu that was first detected in Mexico was declared a global epidemic on June 11,2009. It is the first worldwide epidemic _____（1）by the World Health Organization in 41 years.
The heightened alert_____（2）an emergency meeting with flu experts in Geneva that assembled after a sharp rise in cases in Australia, and rising _____（3）in Britain, Japan, Chile and elsewhere.
But the epidemic is “_____（4）”in severity, according to Margaret Chan, the organization’s director general, _____（5）the overwhelming majority of patients experiencing only mild symptoms and a full recovery, often in the _____（6）of any medical treatment.
The outbreak came to global _____（7）in late April 2009,when Mexican authorities noted an unusually large number of hospitalizations and deaths _____（8） healthy adults. As much of Mexico City shut down at the height of a panic, cases began to _____（9）in New York City, the southwestern United States and around the world.
In the United States, new cases seemed to fade_____（10） warmer weather arrived. But in late September 2009,officials reported there was_____ （11）flu activity in almost every state and that virtually all the _____（12）tested are the new swine flu, also known as (A) H1N1, not seasonal flu. In the U.S., it has _____（13）more than one million people, and caused more than 600 deaths and more than 6,000 hospitalizations.
Federal health officials _____（14）Tamiflu for children from the national stockpile and began _____（15）orders from the states for the new swine flu vaccine. The new vaccine, which is different from the annual flu vaccine, is _____（16）ahead of expectations. More than three million doses were to be made available in early October 2009, though most of those _____（17）doses were of the FluMist nasal spray type, which is not _____（18）for pregnant women, people over 50 or those with breathing difficulties, heart disease or several other _____（19）. But it was still possible to vaccinate people in other high-risk groups: health care workers, people 20 infants and healthy young people.