DENVER -- The Colorado Department of Health said Sunday there are two newly confirmed cases of H1N1 flu in Jefferson County.

The Centers for Disease Control first reported the new cases earlier in the day.

One of the new cases is a man in his 20s.

The other is a middle school age boy.

Health officials say both of the newest victims have traveled recently to Mexico or parts of the U.S. where the flu has been found.

Several people told 7NEWS the boy recently visited New York as part of a school-related trip, although school and health officials declined to discuss where the boy traveled citing privacy issues.

The school's website lists an "extended field study" to Dana Point, CA. for 6th graders, and similar trip for 7th and 8th graders to New York City from April 20 - 25. Based on the posted schedule, it's unlear why the boy, who a family friend said is in 6th grade, would have attended the New York trip.

"The new cases are not unexpected, and do not change the state's approach to the H1N1 flu outbreak," said Dr. Ned Calonge, Chief Medical Officer for the Colorado Dept. of Public Health and Environment.

Neither of the newly confirmed patients required hospitalization.

School officials announced Sunday that Excel Academy will be closed for the coming week. Parents are being notified and school work will be done online, said Dr. Cindy Stevenson, Jeffco Schools Superintendent.

Stevenson said the decision to close the school was made amid concerns the virus could spread to other students at the school.

Even though school was not in session last week for spring break, health officials believe other students may have been exposed.

“We have possibly two or three cases that have not been confirmed in the same population, we’re trying to stop it there,” said Dr. Mark Johnson, from the Jefferson County Public Health Department.

Johnson added the boy's younger sibling is one of the suspected H1N1 cases.

"He's doing fantastic," said the father of the Excel Academy student. He asked not to be identified and that details about his son and family remain anonymous.

The father said his younger son, who also attends the school, has improved.

"They're both making a full recovery," he told 7NEWS.

State health officials earlier this week confirmed two people in metro Denver contracted H1N1 flu, though both have recovered.

Colorado health officials are repeating prevention tips and urging calm. So far, they say, people should simply practice good hygiene to avoid getting sick. Unlike other states, no large gatherings such as school graduations or sporting events have been called off in Colorado because of flu fears.

The state health department by Friday had shipped doses of antiviral medication to 13 locations in case the disease spreads.

Health officials say the long delay in H1N1 flu test results this week is no cause for alarm. Even when Colorado can carry out its own tests, people who think they have H1N1 flu won't be tested unless they're very sick or likely to spread the disease, doctors said Thursday.

"The ability to test is a limited resource," said Dr. Ned Calonge, the health department's chief medical officer.

Dr. Daniel Perlman, an infectious disease expert at Porter Adventist Hospital in Denver, agreed there is little reason to fret the delay in testing for H1N1 flu.

"It doesn't matter because if you have the symptoms of the flu, you should stay home," Perlman said. "Most of the disease we're seeing is mild disease and there's no spread if you can stay home and isolate yourself."

Colorado's confirmed cases were an Arapahoe County woman in her 30s who traveled to San Diego and Mexico on a vacation, and a Douglas County man in his 40s who handles baggage at Denver International Airport. Both got sick April 26 but have since recovered.