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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 – Week 33

For week 33 of 2025, rhinovirus/enterovirus activity decreased but remained high compared to other respiratory viruses. Parainfluenza virus 3 activity decreased slightly, with levels similar to the past few weeks. RSV, HMPV, adenovirus, and parainfluenza virus 1 and 2 activities have all remained low in recent weeks.

Laboratory-Based Surveillance for RSV

Laboratory-Based Surveillance for Rhinovirus/Enterovirus

Laboratory-Based Surveillance for Respiratory Adenovirus

Laboratory-Based Surveillance for Human Metapneumovirus

Laboratory-Based Surveillance for Parainfluenza