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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.

Week 9

For week 9 of 2023, parainfluenza virus type 3 detections have reached a high for this season. Human metapneumovirus has decreased in detections, though detections remain higher than those observed in previous years. Adenovirus activity increased and is circulating at higher levels than previous seasons for this time of year. Parainfluenza type 1, parainfluenza type 2, rhinovirus and RSV have decreased in counts.

Week 8

For week 8 of 2023, human metapneumovirus and rhinovirus detections are trending downward from last week, while still maintaining high counts for the season. RSV, parainfluenza virus type two and adenovirus have all decreased in detections. Parainfluenza virus type one and parainfluenza virus type three have increased in counts since last week.

Week 7

For week 7 of 2023, human metapneumovirus and adenovirus detections have reached the highest counts in the past four seasons. Parainfluenza virus type one, parainfluenza virus type three, rhinovirus and RSV activity has decreased in the past week. Parainfluenza virus type 2 has slightly increased in detections.

Week 6

For week 6 of 2023, human metapneumovirus detections have reached the highest counts in the past four seasons. Adenovirus counts have decreased since last week but still maintain high levels of detections. Parainfluenza virus type one and rhinovirus counts have increased. Parainfluenza type 2, parainfluenza virus type 3 and RSV have decreased in detections.

Week 5

For week 5 of 2023, adenovirus and human metapneumovirus virus have reached the highest detections so far this season. RSV activity has decreased, while parainfluenza virus type 1, parainfluenza virus type 2, parainfluenza virus type 3 and rhinovirus all had slight increases in detections this past week.

Week 4

For week 4 of 2023, all non-influenza respiratory virus activity decreased. While adenovirus and human metapneumovirus virus activity decreased, detections are still among the highest this season so far. Parainfluenza type 1, parainfluenza type 2, parainfluenza type 3, rhinovirus and RSV all had slight decreases in activity this past week.

Week 3

For week 3 of 2023, all non-influenza respiratory virus activity has increased. Adenovirus and human metapneumovirus detections have increased, reaching the highest counts of this season so far. RSV, rhinovirus, parainfluenza type 1, parainfluenza virus type 2 and parainfluenza virus type 3 have all slightly increased in detections from the previous week.

Week 2

For week 2 of 2023, Parainfluenza virus type 3 was the only non-influenza respiratory virus that had increased in detections. RSV, parainfluenza virus type 1, human metapneumovirus, and adenovirus all decreased in activity from the previous week. Rhinovirus and parainfluenza virus type 2 detections remained the same.

Week 1

For week 1 of 2023, Human metapneumovirus activity increased substantially, reaching similar counts to this time last year. Rhinovirus, parainfluenza virus type 1 and RSV saw increases in detections. Parainfluenza type 2, parainfluenza type 3 and adenovirus have decreased in activity from the previous week.