USDA Influenza Surveillance Report Published

March 21, 2018 — 

The FY 2018 1st quarter IAV-S report, covering October 1, 2017 - December 31, 2017, has been posted to the USDA Monitoring and Surveillance website. The report can be accessed at https://www.aphis.usda.gov/animal_health/animaldisspec/swine/downloads/fy2018quarter1swinereport.pdf.

Some key report summary items are as follows:

• In FY 2018 Q1, 7,842 samples were submitted for influenza A virus in swine (IAV-S) surveillance from 2,644 accessions.
• H1N1 was the predominant subtype.
• Over the past 8 quarters, H1N2 predominated in Regions 1, 2, 3, 4 and 5. When regions are recorded as "unknown," H1N2 predominates as well (see map in regional section).
• Limited accessions from a region can skew data and lead to misinterpretation. Therefore, less inference can be applied to results from Regions 3, 4, and 5.
• All IAV-S submissions are voluntary and based on clinical case submissions to veterinary diagnostic labs. These data are not a statistically representative sampling of the U.S. swine population.
• Due to the voluntary nature of this surveillance, the information in this report cannot be used to determine regional and/or national incidence, prevalence, or other epidemiological measures, but it may help identify IAV-S trends.