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Colorado just added herds for a new total of 35.
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8 more cases listed by Colorado, 5 were announced by the USDA earlier today. Some numbers are vacant. Last time this happened Colorado filled it in with a dairy cattle description.
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Colorado has skipped from #43 to #45 so I guess that is 2 more herds, i.e #44 and #45 (#43 we already have denoted above).
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The state is still showing 45 total count while the USDA is showing 47 total count.
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Larimer County
/https://en.wikipedia.org/wiki/Larimer_County,_Colorado
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Detections of Highly Pathogenic Avian Influenza in Mammals
Last Modified: July 23, 2024
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state county date_collected date_detected hpai_strain species
Colorado Larimer 07/12/2024 07/22/2024 EA H5N1 Domestic cat
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Detections of Highly Pathogenic Avian Influenza in Mammals
Last Modified: July 31, 2024
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state county date_collected date_detected hpai_strain species
Colorado Weld 07/12/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/12/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/12/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/12/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/12/2024 07/23/2024 EA H5 Deer mouse
Colorado Weld 07/12/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/12/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/12/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/13/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/13/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/13/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/13/2024 07/23/2024 EA H5 Deer mouse
Colorado Weld 07/13/2024 07/23/2024 EA H5N1 Deer mouse
Colorado Weld 07/13/2024 07/23/2024 EA H5N1 House mouse
Colorado Weld 07/13/2024 07/23/2024 EA H5N1 House mouse
Colorado Weld 07/13/2024 07/23/2024 EA H5N1 House mouse
Colorado Weld 07/13/2024 07/23/2024 EA H5N1 House mouse
Colorado Larimer 07/12/2024 07/22/2024 EA H5N1 Domestic cat
Colorado Larimer 07/16/2024 07/22/2024 EA H5N1 Domestic cat
Colorado Larimer 07/14/2024 07/22/2024 EA H5N1 Domestic cat
Colorado Weld 07/11/2024 07/22/2024 EA H5N1 Desert cottontail
Colorado Weld 07/11/2024 07/22/2024 EA H5N1 Deer mouse
Colorado Weld 07/11/2024 07/22/2024 EA H5N1 House mouse
Colorado Weld 07/11/2024 07/22/2024 EA H5N1 House mouse
Colorado Weld 07/11/2024 07/22/2024 EA H5N1 House mouse
Colorado Weld 07/11/2024 07/22/2024 EA H5N1 House mouse
Colorado Weld 07/11/2024 07/22/2024 EA H5N1 Prairie vole
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Translation Google
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The USDA posted an entry for August 2nd that showed a new herd for Colorado but that entry is now gone. I am going to wait to the end of the day to see what else happens before I update our list.Comment
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Colorado state just added 12 dairy positive results to their list. #52 - 63 inclusive. This includes 9 with positive results to bulk tank testing:
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hat-tip Rick Bright
@RickABright
Colorado Department of Public Health & Environment
09 Aug Influenza A (Highly Pathogenic Avian Influenza H5N1) in domestic cats
Six feline cases of Influenza A (HPAI H5N1) have been diagnosed in domestic cats in Colorado during 2024. One of these cases was directly associated with a known infected commercial dairy facility. Two of the six cases were indoor only cats with no direct exposures to the virus. Three of the six cases were known indoor/outdoor cats that hunted mice and/or small birds as prey and also spent time indoors with their owners. Five of the six cases have presented with similar clinical signs and disease progression: an initial complaint of lethargy and inappetence, followed by progressive respiratory signs in some and fairly consistent progressive neurologic signs in most. Several of these cases were tested for rabies preceding diagnosis with H5N1 infection due to the indistinguishable presentation once neurologic signs presented. HPAI H5N1 infection should be considered in domestic felines even if all of the risk factors or clinical signs are not present. There is high abundance of virus in Colorado at this time, predominantly being detected in domestic dairy cattle in commercial dairy herds with spillover into mammals and wild birds on and near these premises. Notably the B3.13 strain of the Eurasian 2.3.4.4b clade H5N1 virus has been spreading in animals not historically attributed as reservoirs for the HPAI virus. This lineage of virus has not been detected in migratory waterfowl at this time.
Click here for our current guidance document for veterinarians evaluating feline cases for HPAI infection.
Any questions, please refer to the CDPHE zoonoses team at cdphe_zoonoses@state.co.us or the Animal Health Division with CDA at animalhealth@state.co.us.
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This is related to the previous post:
Bird flu cases now detected in domestic cats in Colorado
By John Daley
Aug. 12, 2024, 6:36 pm
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Six feline cases of Influenza A (also known as HPAI, Highly Pathogenic Avian Flu H5N1) have been diagnosed in domestic cats in Colorado so far this year...
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“It's just remarkable how fast and furious it's moving. So I hope we can get a handle on it soon,” said Kay Russo, a Colorado veterinarian with RSM Consulting who has worked with both dairy cows and poultry, which have been hard hit by the virus this year.
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No known human cases of H5N1 have been linked to exposure to infected cats, according to the state health department.
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“People with direct contact to infected cats should be considered at the same risk as those in direct contact with other infected animals, such as cows or poultry,” she wrote in an email. “The risk of human infection from contact with cats is not well understood."
The five cases listed on the USDA website are all of the same strain, H5N1, which raises the level of concern, according to May Chu, an epidemiologist and clinical professor from the Colorado School of Public Health. She suggested more testing is needed, in particular, sequencing of the full genome of these strains to investigate the chain of transmission.
The details regarding H5 bird flu in domestic cats on the CVMA website said two of the six cases were “indoor-only cats with no direct exposures to the virus,” according to the post.
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“I think the link is potentially here with the house cats that don't go outside is we're seeing a lot of mice that are testing positive for H5N1,” said Russo. “So I wonder perhaps if these wild mice populations are picking up the virus and then bringing that into the houses. Because in Colorado we tend to see mice get in fairly frequently, especially as the weather shifts.”
Or perhaps owners are feeding the cat a raw diet or the owner thinks of their cat as an indoor cat, but it actually does spend time outdoors. Still, “the indoor-only cats is what's pretty concerning,” said Russo.
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Russo urges cat owners to especially look out for those neurologic symptoms.
“As soon as you start to see that progression, which is fairly rapid from what I've understood, get that animal into the veterinarian and alert your veterinarian that you are seeing symptoms that could be indicative of influenza infection,” Russo said. “And it's really important that the owners and the veterinarians observe utilization of proper PPE because this is in fact a zoonotic infection,” meaning it can jump from animals to humans.
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