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Other Respiratory Virus Weekly Reports

Laboratory-Based Surveillance

The following graphs depict the aggregate results of PDPH's respiratory virus surveillance. Care should be taken with the interpretation of these results.

These summaries display the provisional, year-to-date counts (or, in some cases, percentage positivity) of respiratory viruses by week of report. Comparable data for preceding years are shown as well.

All surveillance data are preliminary and are not intended for further distribution.

Week 35

For week 35 of 2021, RSV was the predominant circulating non-influenza respiratory virus, with approximately 19% of tested specimens positive for RSV. Over the past weeks, RSV activity has continued to increase to abnormally high levels compared to recent seasons for this time of year. Additionally, parainfluenza virus 2 activity has increased recently compared to previous years. In contrast, rhinovirus activity has decreased to levels consistent with previous seasons while parainfluenza virus 3 activity has also continued to decrease since its summer peak. Parainfluenza virus 1, human metapneumovirus, and adenovirus are currently circulating at levels consistent with previous seasons.

RSV

Rhinovirus

Respiratory Adenovirus

Metapneumo-virus

Parainfluenza

Week 30

For week 30 of 2021, rhinovirus remained the predominant circulating non-influenza respiratory virus, with approximately 23% of tested specimens positive for rhinovirus. Additionally, RSV activity has continued to increase during July, with approximately 14% of tested specimens positive for RSV. This sustained trend is abnormal given that RSV typically circulates at very low levels during the summer months. Parainfluenza virus 3 activity has also continued to remain high; however, the trend is similar to previous seasons before the COVID-19 pandemic, though it has occurred slightly later in the season than previous years. Parainfluenza virus 2 activity recently increased to higher levels compared to previous years. Adenovirus and human metapneumovirus activity have remained consistent with previous seasons while parainfluenza virus 1 activity has remained lower than previous seasons.

RSV

Rhinovirus

Respiratory Adenovirus

Metapneumo-virus

Parainfluenza

Week 23

For week 23 of 2021, rhinovirus was the predominant circulating non-influenza respiratory virus, with approximately 33% of tested specimens positive for rhinovirus. During May and June, rhinovirus and RSV activity has continued to increase to a higher percent positivity in contrast to previous seasons. The increase in RSV activity is abnormal given that RSV generally circulates at low levels during the summer months. Parainfluenza virus 3 cases have also increased significantly; however, the trend is similar to previous seasons before the COVID-19 pandemic. Adenovirus and parainfluenza virus 2 activity has remained consistent with previous seasons while human metapneumovirus and parainfluenza virus 1 activity has remained lower than previous seasons.

RSV

Rhinovirus

Respiratory Adenovirus

Metapneumo-virus

Parainfluenza

Week 14

For week 14 of 2021, rhinovirus has remained the predominant circulating non-influenza respiratory virus, with approximately 18% of tested specimens positive for rhinovirus. After a sharp increase in activity in March, rhinovirus activity has decreased during April to levels similar to previous seasons. Adenovirus activity has remained consistent with previous seasons. RSV, human metapneumovirus, and parainfluenza virus activity has remained lower than previous seasons.

RSV

Rhinovirus

Respiratory Adenovirus

Metapneumo-virus

Parainfluenza

Week 3

For week 3 of 2021, rhinovirus was the predominant circulating non-influenza respiratory virus, with approximately 15% of tested specimens positive for rhinovirus. Rhinovirus activity has been variable, but has shown an increasing trend in January, occurring earlier in the year than the past two seasons. Adenovirus activity has remained consistent with previous seasons. RSV, human metapneumovirus, and parainfluenza virus activity has remained significantly lower than previous seasons.

RSV

Rhinovirus

Respiratory Adenovirus

Metapneumo-virus

Parainfluenza

Counts