SEATTLE -- People suspected of having swine flu in Washington state include a pediatrician who treated 22 patients before falling ill, a 3-year-old boy who recently traveled with his family to Mexico, and a Seattle boy whose case resulted in his school being closed for a week, health officials said Thursday.

In addition to six cases listed as probable swine flu by the state, Dr. David Fleming, director and health officer for Public Health-Seattle & King County, on Thursday reported seven more probable cases in the Seattle area, including six children.

At a Thursday afternoon briefing: officials said of the seven new probable cases, two of them are children who are related to the 37-year-old pediatrician from Seattle who saw 22 patients and their parents earlier this week at The Everett Clinic's Mill Creek office before falling ill, the clinic said.

The clinic has since contact her patients and only one person reported flu-like symptoms, the clinic said.

1 Report Of Flu-Like Symptoms From Everett Clinic Patients

Officials said in addition, the other probable cases are:

Two children who are siblings of the Madrona student identified as a possible case

Two other children who are unrelated to previous cases

A woman in her 20s

"Probable" means that the laboratory results at state level are not yet confirmed by US Centers for Disease Control and Prevention (CDC). Currently the CDC is the only public health lab in the country that can positively identify this virus.

Snohomish County is currently reporting two probable cases of the swine flu, including one of a 3-year-old boy in Snohomish who probably picked it up while travelling in Mexico.

A 34-year-old Lynnwood woman whose husband and two children are also sick, but haven't shown indications of swine flu.

Four cases from Kitsap County are being tested for swine flu, but nothing has been confirmed and no schools are reported closed. Health officials are expected to meet with school administrators.

More weeklong school closures are expected.

"My prediction would be several more school closures," said Dr. David Fleming, Director and Health Officer for the health department.

As of now, three Seattle schools are closed Friday and some are closed through next week. Madrona K-8 will not reopen until next Thursday. One Federal Way school is also closed all next week. For more information:

List Of School Closures

"We thought this was an important precaution," Dr. Jeff Duchin of the health agency told a Thursday morning news conference outside the school.

An 11-year-old student at Madrona K-8 school had a cough and fever Monday and his mother kept him home, school officials said. He was later hospitalized and is recovering.

School district spokesman David Tucker said officials had planned to allow the school to remain open, but health investigators determined the infected boy may have been ill last Friday at the school.

State Health Department spokesman Tim Church said Thursday that it and the federal Centers for Disease Control and Prevention were continuing to test Washington samples for swine flu. The state is waiting for confirmation on the six suspected cases from the CDC. About 70 samples have been sent so far to the state testing lab in Shoreline, he said.

Elsewhere in the region, health officials in Oregon reported the state's first probable case of swine flu Thursday in Multnomah County. Officials in Idaho have not confirmed any cases of swine flu but have alerted medical care providers to continue watching for flu-like illnesses. The state has tested 26 samples from people suspected of having the illness and all were negative. Another 12 samples are under investigation.

No confirmed cases have been reported in Alaska.

Gov. Chris Gregoire urged calm Thursday, saying the health system is responding well and the public should not be alarmed.

"At this point, we would say carry your lives out like you do every single day," Gregoire said. "But do what you do in any flu season: take precautionary steps, and now, if you're feeling ill, be sure you see your health care provider."

The state expects to get about 230,000 additional courses of antiviral drugs from the federal government no later than May 3, she said.

In the U.S., the outbreak has hit 16 states with one confirmed death, a Mexican toddler who visited Texas with his family.