SAN RAMON, Calif. -- The Contra Costa County Health Department Saturday announced that Coyote Creek Elementary School and Lone Tree Elementary schools would be shut down for at least one week after a student at each tested probable for the H1N1/Swine Flu virus.

Elsewhere, officials around Northern California announced more school closures Friday as a precaution to stop the spread of swine flu.

Schools in Marin, Contra Costa, Yolo, Tulare and San Joaquin counties were all shut down Friday. (See a list of Bay Area school closings)

In Marin, officials shut down a San Rafael elementary school and community center after a student was diagnosed with a probable case of the virus.

Dr. Fred Schwartz, the county's public health officer, said Bahia Vista Elementary School will be closed until at least next Thursday. An after school program and the library at Pickleweed Park Community Center also were closed.

In Contra Costa County, officials decided Friday to shut down a second school -- Shores Acres Elementary in Bay Point -- after a second-grader came down with a probable case. They said Shores Acres would remain closed for 14 days, following new recommendations by the federal government to extend school closures because children can be contagious for seven to 10 days from when they get sick.

Contra Costa officials also decided to extend the closure to 14 days for Pittsburg's Highlands Elementary, which sent students home earlier this week because of a probable swine flu case.

Holmes Junior High School in Davis will be shuttered for one week after the Yolo County health department found a student there had a probable case, officials said Friday.

In Tulare County, where a Visilia school was closed earlier this week, officials chose to cancel classes at two more, even though no swine flu cases have been found.

The decision was made at Sunnyside Elementary "because there is a student who we know to have had contact with a probable or confirmed case," said Allison Lambert, spokeswoman for the Tulare County Health and Human Services Agency. Sunnyside did not say when it would reopen.

The county's Woodville Elementary also will stay closed for a week while health officials test a cluster of students there who've come down with flu-like symptoms. None of those cases have yet been connected to swine flu.

In San Joaquin County, officials shut down Linden Elementary School for the next week over suspicion a student has contracted swine flu.

Schools in Santa Clara and Sacramento counties also have called for swine flu-related shutdowns.