"It's possible that there may be more school closings this week; we'll make the decision based on what occurs on the days to come," he said. "There are many, many factors to consider when recommending closure, but obviously the health of our children, the school community, the teachers and staff is foremost."
No one else in the city has become seriously ill from the virus, but city health officials announced Sunday that four Queens public schools and one Catholic school would close for up to five school days. Three of the public schools are in the same building, and each school had students with flulike illness last week.
Schuchat said as the weather warms, she expects the numbers of people contracting the virus to drop, but she added the CDC would look closely at the Southern Hemisphere, which will soon enter its winter months.
Today Japanese health officials said the number of cases surged to at least than 121 over the weekend. Most of the sick are teenagers who have tested positive for the virus, and all were recovering in local hospitals or their homes.
Chile also confirmed its first two swine flu cases Sunday in two women who arrived on a flight from the Dominican Republic. The women, ages 25 and 32, are hospitalized and in good condition, Health Minister Alvaro Erazo told The Associated Press.
In response to swine flu worries, the World Health Organization will discuss whether a vaccine should be made and whether to raise the global alert level today at its annual meeting. The topic is expected to dominate the five-day annual meeting, which begins Monday in Geneva and involves health officials from the agency's 193 member states.
Officials will examine transmission rates and hear experts' recommendations on producing a swine flu vaccine.
The Associated Press contributed to this story.