2016 H3N2v Cases In Michigan and Ohio Increase To 18

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Seven human infections with novel influenza A viruses were reported by two states (Michigan [4] and Ohio [3]) during week 33. All seven persons were infected with influenza A (H3N2) variant (H3N2v) viruses and reported exposure to swine in fair settings during the week preceding illness onset. 

http://www.cdc.gov/flu/weekly/

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Novel Influenza A Viruses:

Seven human infections with novel influenza A viruses were reported by two states (Michigan [4] and Ohio [3]) during week 33. All seven persons were infected with influenza A (H3N2) variant (H3N2v) viruses and reported exposure to swine in fair settings during the week preceding illness onset. To date, a total of 18 (Michigan [12] and Ohio [6]) human infections with H3N2v viruses have been identified during 2016, all reported during the month of August. One of the 18 persons were hospitalized as a result of H3N2v illness. No deaths have occurred. All variant virus infections have been associated with swine exposure in fair settings. No human-to-human transmission has been identified. Public health and agriculture officials are investigating the extent of disease among humans and swine, and additional cases may be identified as the investigation continues.

Early identification and investigation of human infections with novel influenza A viruses are critical to ensure timely risk assessment and so that appropriate public health measures can be taken. Additional information on influenza in swine, variant influenza infection in humans, and strategies to interact safely with swine can be found athttp://www.cdc.gov/flu/swineflu/index.htm.

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	edit	Name	Isolate ID	Subtype	Passage	PB2	PB1	PA	HA	NP	NA	MP	NS	HE	P3	Collection date

	edit	Name	Isolate ID	Subtype	Passage	PB2	PB1	PA	HA	NP	NA	MP	NS	HE	P3	Collection date
		A/Michigan/84/2016	EPI_ISL_232047	H3N2	OR	---	---	---	1701	---	1358	---	---	---	---	2016-08-11
		A/Michigan/83/2016	EPI_ISL_232048	H3N2	OR	2316	2286	2208	1737	1540	1441	1002	865	---	---	2016-08-09
		A/Michigan/82/2016	EPI_ISL_232046	H3N2	OR	2264	2274	1094	956	---	1360	970	664	---	---	2016-08-09
		A/Ohio/28/2016	EPI_ISL_232045	H3N2	OR	2264	2274	---	1701	---	1342	969	838	---	---	2016-08-04
		A/Ohio/27/2016	EPI_ISL_232044	H3N2	OR	2264	2274	2151	1693	1497	1363	982	838	---	---	2016-07-30

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Case Count: Detected U.S. Human Infections with H3N2v by State since August 2011

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Table 1. Case Count: Detected U.S. Human Infections with H3N2v by State since August 2011

States Reporting H3N2v Cases	Cases in 2011	Cases in 2012	Cases in 2013	Cases in 2014	Cases in 2015	Cases in 2016
Hawaii		1
Illinois		4	1
Indiana	2	138	14
Iowa	3	1	1
Maine	2
Maryland		12
Michigan		6	2		1	12
Minnesota		5			1
New Jersey					1
Ohio		107	1	2		6
Pennsylvania	3	11
Utah		1*
West Virginia	2	3
Wisconsin		20		1
Total	12	309	19	3	3	18

* Case in Utah occurred in April 2012.

This chart indicates the number of CDC-reported infections with H3N2v influenza A viruses since August 2011. This case count will be updated on Fridays as new cases are reported.

NOTE: The state totals reported by CDC may not always be consistent with those reported by state health departments. If there is a discrepancy between these two counts, data from the state health departments should be used as the most accurate number.

Table 2. H3N2v Hospitalizations and Deaths Since July 2012*

H3N2v Hospitalizations and Deaths Since July 2012	Cases in 2012	Cases in 2013	Cases in 2014	Cases in 2015	Cases in 2016
Hospitalizations	16	1	1	2	1
Deaths	1	0	0	0	0

* As reported by states to CDC. This chart indicates the number of CDC-reported infections with H3N2v influenza A viruses since July 2012. This case count will be updated when new cases are reported.

See Reported Infections with Variant Influenza Viruses in the United States since 2005 for a complete list of human infections with all variant viruses since 2005.

http://www.cdc.gov/flu/swineflu/h3n2v-case-count.htm

[niman]

Novel Influenza A Viruses:

No additional human infections with novel influenza A viruses were reported to CDC during week 34. To date, a total of 18 (Michigan [12] and Ohio [6]) human infections with H3N2v viruses have been identified during 2016, all reported during the month of August. One of the 18 persons were hospitalized as a result of H3N2v illness. No deaths have occurred. All variant virus infections have been associated with swine exposure in fair settings and no human-to-human transmission has been identified.

Early identification and investigation of human infections with novel influenza A viruses are critical to ensure timely risk assessment and so that appropriate public health measures can be taken. Additional information on influenza in swine, variant influenza infection in humans, and strategies to interact safely with swine can be found athttp://www.cdc.gov/flu/swineflu/index.htm.