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From: *Hemidactylus* <ecphoric@allspamis.invalid>
Newsgroups: talk.origins
Subject: Re: California Dairy herds positive for the dairy virus
Date: Wed, 18 Sep 2024 16:11:29 +0000
Organization: University of Ediacara
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RonO <rokimoto557@gmail.com> wrote:
> On 9/17/2024 1:18 PM, x wrote:
>> 
[snip]
>> 
>> Ok.  Sorry to have implied that about a joke.
>> 
>> What is going on with the flu strains with a 50% fatality rate?
> 
> There is an Asian and European H5N1 strain of avian influenza that has 
> been responsible for over 800 human deaths (50% mortality of known 
> infected humans).  Infection is not a common occurrence and requires 
> contact with infected birds.  Wild bird migration brought this virus to 
> North America, but the virus that infected the Dairy cattle was a 
> recombinant with another North American avian influenza strain.  It 
> inherited the H5 and N1 antigen genes from the Asian virus, but around 
> half of it's genome comes from another influenza virus.  This is likely 
> why it doesn't have a 50% mortality when it infects humans.  So far 
> humans have only exhibited mild symptoms, but the worry is that the 
> virus will mutate to better infect humans and become more pathogenic.
> 
>> 
>> Is that something involving low numbers of infected and statistics
>> or is that something real about the nature of those flu strains?
> 
> As noted above the Asian H5N1 has infected fewer than 2,000 people in 
> Asia and Europe, but over 800 of them died due to the infection.
> 
>> 
>> Does that involve differences in antigen presentation?
> 
> Due to the recombinant half, the dairy virus is antigenically different 
> than the Asian H5N1, but initially the H5 antigen was neutralized by 
> related H5 virus that the CDC had already banked for vaccine use.  One 
> thing that they are not making a big deal about is that the latest human 
> case (without known animal contact) in Missouri has a couple of amino 
> acid substitutions relative to the original dairy H5 and the Missouri H5 
> can avoid the existing H5 antibodies, and those antibodies are now 10 to 
> 100 times less effective in neutralizing an infection.  This just means 
> that they have to start working up a vaccine strain with the new H5 
> mutations.
> 
>> 
>> Do they have symptoms similar to other flu but more severe
>> or can they have vastly different symptom sets in comparison
>> with other colds or flus?
>> 
> 
> Most of the humans infected with the dairy virus have mild symptoms with 
> most of them having only itchy eyes.  The virus was not isolated from 
> nasal swabs so the infection had not become respiratory.  Virus has been 
> isolated from eye swabs of infected individuals.  The latest Missouri 
> example is different.  Apparently the virus was detected in samples 
> taken normally to check for respiratory infections, but the patient was 
> not exhibiting the normal respiratory symptoms.  Instead the patient had 
> "nausea, vomiting, diarrhea and weakness".  The CDC has noted that these 
> are not the normal respiratory symptoms of influenza, but they do not 
> note that these are symptoms that have been associated with the H5N1 
> Asian virus with a high human mortality.  The CDC seems to have the goal 
> of downplaying how bad things probably are.
> 
So the common misnomer of “stomach flu” applied to norovirus would actually
apply in cases where influenza infection actually does result in digestive
symptoms?

So if someone says “I have stomach flu” I would now reply “I sure hope
you’re wrongly calling noro that, because actual H5 stomach flu is much
worse!”