The state Department of Health Services is reporting 37 confirmed cases of respiratory syncytial virus, or RSV, so far this season, according to a weekly report out late last week.

Arizona continues to see elevated levels of respiratory syncytial virus (RSV).

Fewer Arizonans are experiencing the flu this year - much fewer - based on statistics from the Arizona Department of Health Services.

The state has confirmed 90 cases of respiratory syncytial virus this season, according to the latest report for the week ending Dec. 17.

The sniffles, runny nose and cough going around your home may be a cold, but recent numbers also show RSV is ramping up in the Valley.

This time is always busy for hospitals and emergency rooms, but the severity of illnesses may be above average this year, officials say.

This time is always busy for hospitals and emergency rooms, but the severity of illnesses may be above average this year, officials say.

Arizona's flu and RSV activity is peaking earlier than usual, according to the state Department of Health Services.

The widespread flu outbreak throughout Arizona apparently hasn’t hit the West Valley. Health officials say visits to area hospitals this year due to the spread of the flu have been typical as in years past and that they have only seen a handful of patients each week seeking treatment for the airborne illness.

Mesa's Cardon Children's Medical Center saw a record-breaking number of patients in January, confirming that influenza and RSV season is in full swing in the Valley.

Mesa's Cardon Children's Medical Center saw a record-breaking number of patients in January, confirming that influenza and RSV season is in full swing in the Valley.

Mesa's Cardon Children's Medical Center saw a record-breaking number of patients in January, confirming that influenza and RSV season is in full swing in the Valley.

Mesa's Cardon Children's Medical Center emergency department opened 14 additional pediatric beds this week, just in time for the additional patients needing care for flu and RSV.

Arizona saw its first pediatric death related to influenza during the week ending Jan. 1, according to the state Department of Health Services website. The state also saw a spike in the number of lab-confirmed influenza cases, with the respiratory illness now being classified as "widespread" in the state.

Phoenix Children's Hospital began respiratory virus visitor restrictions Monday. Each year hospitals use visitor restrictions when respiratory viruses like influenza and RSV (respiratory syncytial virus) become more common.

The number of lab-confirmed influenza cases in the county nearly doubled last week, according to the latest report on the Arizona Department of Health Services website. There are now 33 lab-confirmed cases in Maricopa County, with 13 of them diagnosed last week. Across the state, 103 influenza cases have been confirmed. Fifty-two percent are in patients 18 and younger. Most are influenza A, the same type associated with the novel H1N1 strain identified last year. Influenza levels remain far below the 2009-2010 numbers.

Doctors are starting to see cases of RSV — respiratory syncytial virus — a disease that can cause lung illness in children.

Doctors are starting to see cases of RSV — respiratory syncytial virus — a disease that can cause lung illness in children.

Doctors are starting to see cases of RSV — respiratory syncytial virus — a disease that can cause lung illness in children.

Flu activity in the state remains "sporadic" according to the latest weekly report from the Arizona Department of Health Services. As of Thursday, there have been 27 lab-confirmed cases of influenza since the season began Sept. 26. Of those, 12 are in Maricopa County. At this time last year, influenza activity was "widespread."

The near-record rainfall levels in January, followed by some spring-like, warmer days in February, has sparked tree pollen growth in the Valley.