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Commentary
Fujian H5N2 In Midwest Turkey Farms Accelerates
Recombinomics Commentary
April 11, 2015 22:30
ND Dickey Central Commerce Turkeys H5N2 April 11
MN Kandiyohi Mississippi Commerce Turkeys H5N2 April 11
SD McCook Central Commerce Turkeys H5N2 April 10
SD McPherson Central Commerce Turkeys H5N2 April 10
MN Cottonwood Mississippi Commerce Turkeys H5N2 April 9
MN Lyon Mississippi Commerce Turkeys H5N2 April 9
MN Stearns Mississippi Commerce Turkeys H5N2 April 9
MN Watonwan Mississippi Commerce Turkeys H5N2 April 9
SD Kingsbury Central Commerce Turkeys H5N2 April 8
MN Meeker Mississippi Commerce Turkeys H5N2 April 8
MN Kandiyohi Mississippi Commerce Turkeys H5N2 April 7
MN Kandiyohi Mississippi Commerce Turkeys H5N2 April 4
MN Stearns Mississippi Commerce Turkeys H5N2 April 4
MT Judith Basin Central Backyard Mixed H5N2 April 2
MN Stearns Mississippi Commerce Turkeys H5N2 April 2
SD Beadle Central Commerce Turkeys H5N2 April 1
MN Nobles Mississippi Commerce Turkeys H5N2 April 2
MN Stearns Mississippi Commerce Turkeys H5N2 March 28
MN Lac Qui Parle Mississippi Commerce Turkeys H5N2 March 27
KS Leavenworth Central Backyard Mixed H5N2 March 13
AR Boone Mississippi Commerce Turkeys H5N2 March 11
MO Moniteau Mississippi Commerce Turkeys H5N2 March 10
MO Jasper Mississippi Commerce Turkeys H5N2 March 9
MN Pope Mississippi Commerce Turkeys H5N2 March 4
The
above April
11 APHIS list cites the reported farm H5N2 outbreaks since March
4. There are two new farms, which increases the total H5N2
confirmed turkey farms to 10 for the past 4 days.
These
cases are clustered on both sides of western border of Minnesota (see H5N2
map), the dividing line between the Central and Mississippi
Flyways, which is more of an administrative than biological
division. The current
wave began with a confirmation on March 27, and 18 of the 19
confirmations were In Minnesota (13), South Dakota (4), or North Dakota
(1). All 18 were commercial turkey farms and involved over 1
million turkeys.
Turkeys
have a higher
susceptibility to Fujian H5 than other poultry, and the combination
of concentrated turkey farms and migrating waterfowl has taken its
toll. The two Minnesota counties with the largest number of
turkey farms are Kandiyohi, which has had 3 outbreaks, and Stearns,
which has had 4 outbreaks. All other counties have had a single
confirmed farm, which discounts farm to farm transmission (because of
strong biosecurity, which has also limited barn to barn transer)..
The
recently reported confirmation of Fujian clade 2.3.4.4 H5 in a lesser
snow goose in northwestern Missouri corresponded in time and space with
the earlier outbreaks in Arkansas, Missouri, and Kansas may have been a
precursor for the outbreaks in the region to the north.
Iowa
has indicated 150
snow geese would be collected from hunters during the spring
season, and other states are following suit.
However,
the sampling levels are significantly lower than the enhanced
surveillance in the administrative Pacific flyway, which has produced over
50 H5 (H5N8, H5N2, H5N1) positive wild birds during hunting season
(in December and January).
The
turkey farm bird flu infections are expected to increase in spite of
strong biosecurity, because of increased wild bird migration in these
northern states which will be followed by movement into Canada to the
north.
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