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.

Activity Summary

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.

Laboratory-Based Surveillance Rhinovirus

Laboratory-Based Surveillance Respiratory Adenovirus

Laboratory-Based Surveillance Human Metapneumovirus

Laboratory-Based Surveillance Parainfluenza




Updated: 06/17/2021