GREENDALE and MILWAUKEE - The list of schools closing due to sickness, including probable cases of swine flu, is growing.

The latest school among the list to temporarily shut down is Morningstar Lutheran School in Jackson.  Nearly half the children attending school there have some sort of sickness.  

After the discovery that almost all the flu cases in Greendale are probably swine flu, officials with the Greendale, Wis. School District have closed Canterbury Elementary School through Thursday, October 22nd.  

One student from that school with an underlying health problem has been hospitalized because of the outbreak.

Officials also announced Tuesday that Hartland South Elementary School in Waukesha County is shutting down.  More than 40% of the school's student body are home sick. 

Most of the 140 students that went home sick from Greendale's Canterbury Elementary School had flu-like symptoms.  Nine Canterbury staff members also came down with the flu as well.

"There has been ongoing surveillance of the viruses in the community, and as of the report of last week, all of the circulating viruses up to 99% of them have been the H1N1 influenza virus, with a small amount being the parainfluenza viruses which are less than a percent," said Greendale Health Director Susan Shepeard.

"Based on the symptoms and the fact there is no seasonal flu circulating at this time, it is of high confidence we are saying it is H1N1. We will have some lab work available to confirm it, but we don't have it right now."

Other activities at the school have been canceled, according to Greendale Schools Superintendent Dr. Bill Hughes.

Pending Shepeard's approval, the school will reopen Friday, October 23rd.

"I will not reopen the school unless I'm comfortable that the children who are incubating now and coming down sick stay home, and those who are coming back to school are better and can stay in school."

All other schools in Greendale will remain open for now.

Shepeard stated that the city has a small amount of swine flu vaccine.  She suggested that children should stay home for 24 hours after the fever is gone and they have no need for medication.

"It's very important that people take measures to stay healthy, to protect themselves."

Crews are cleaning up all five Greendale schools in an effort to make sure no similar outbreaks happen at the other schools.