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FoxNews is reporting that the World Health Organization has raised the pandemic threat level from 3 to 4. This, on a scale of 1 to 6.

This is not surprising, but it is disconcerting nonetheless.  Watch the cable networks for details.  MSNBC is preapred to show the press conference live at www.msnbc.com.

Some 30 children at a Bronx day care center have been tested for swine influenza. they exhibited flu-like symptoms.

A hat-tip to Flutrackers.com poster Legatillo. Link is: http://www.ny1.com/content/top_stories/98016/cdc-confirms-swine-flu-cases-at-queens-school/Default.aspx

The alert just went up:  The State Department has said Americans should not go to Mexico unless that travel is absolutely essential.  Stay tuned to mainstream media outlets for the news.

The only area in Mexico that appeared to be unaffected by the swine flu epidemic was the Yucatan Peninsula.

Was.

The local news is reporting (with a massive tip o' the cap to Laidback Al, poster of Flutrackers.com (is that like Nick Fury, Agent of S.H.I.E.L.D. or Bob, Agent of Hydra for you Deadpool fans?), who posted the story this morning.

At first, the local authorities said they had no suspected cases of swine flu. But when the press mentioned the French tourist by name -- well, denial gets a bit tougher.

Here is the story, from Diario de Yucatan. translation by Laidback Al's computer.

Denying a suspected case of influenza in Valladolid
26/Apr/09

VALLADOLID .- Although an attempt was made to deny officially confirmed yesterday that a French tourist with symptoms of influenza remains hospitalized in the hospital of this city.

Gustavo Lastra Diaz, director of the hospital in Valladolid, denied in principle that the alien was in the hospital.

No, no, no, "said the official in question by a reporter for the Journal.

However, when mentioning the name of the French tourists changed their version and confirmed that is hospitalized.

-Tomorrow (today), and with laboratory tests, will release official said Lastra Diaz.

The French were in Chichén Itzá after staying with a fellow group of several days in Mexico City.

The biggest concern many public health and homeland security fear is that all those Spring Breakers went down to Cancun, or Acapulco, and got more than a hangover. Many of us were breathing easier when we noticed there were no cases coming out of Yucatan.

But this disclosure, especially with the disclosure that such a popular tourist destination as the Mayan ruins of Chichén Itzá might be impacted, is especially troubling. 

I have watched the White House press briefing three times now. There are some things which stood out for me.

Encapsulated: We do not know if we are watching the first infant signs of an epidemic, or if by some strange stroke of Fate we are already experiencing the "first wave" of an epidemic or pandemic. We have not tested enough people prior to April 1 to get a handle on that answer. No one has.

Why not? Simply, the symptoms were not severe enough for anyone to suspect that another strain of influenza was at work -- at least, not until Mexicans started dropping dead in significant numbers. Then, and only then, did the next, more sophisticated level of testing take place.

In 2009, it is (regrettably) common for people not to be tested for influenza if they go to their family doctor. I, for example, have never been swabbed for flu -- and I have had several different doctors treat me for different respiratory ailments over the past two decades. If you don't swab, you can't test. If you don't test, you can't type.

It is this lack of serious illness that worries us in Egypt, and in Indonesia, and in other regions where H5N1 has become endemic. There is absolutely no way to determine the level of penetration of a virus without testing blood for antibodies. This is precisely the exercise the Egyptian government and the WHO are collaboratively taking with human samples -- to look for antibodies to avian H5N1 and to see if the disease has asymptomatic carriers.

We won't know if this swine variant has been with us for awhile until many months from now.

I am wondering if the comment from DHS about the number of swine flu cases abating, and then picking up again after a few weeks, is actually code for the USanticipating a wave of a pandemic. This would make sense if you view the big picture of the US response. The increased surveillance is obviously meant to see how widespread and how rapidly the virus is moving. The pre-positioning of antivirals is not just to be ready to treat mildly sick Americans -- it is also meant to quickly treat deathly ill Americans in case the virus evolves quickly and begins to attack with as much lethality as it appears is currently taking place in Mexico.

Let me take you back to 1918.Back then, the prevailing opinion was that flu was a bacteria and not a virus. Also, influenza was not a "reportable disease" like it is now. There were many, many cases and a lot of deaths, but nothing near what was to come.

It was the second wave that got everyone's attention. And then the third and final wave came, which was milder than the second but worse than the first. Then H1N1 settled into the lexicon of seasonal viruses.

Let's look at the current rate of deaths in Mexico. A quick bit of calculus can tell us how many cases may be underreported in Mexico. If we look at 80 deaths and 1400 cases, we see the Case Fatality Rate (CFR) somewhere between 5 and 6 percent. If the CFR were something much more reasonable -- say, 1% -- then we are looking at some 8,000 cases.

Influenza's goal is not to kill its hosts. It is to coexist with its hosts. Even the 1918 pandemic's CFR was somewhere between 2 and 2.5% of those infected. Still, if the CFR in Mexico is at 1%, then the virus is far more widespread and the chances for an epidemic are magnified exponentially.

Also, the fact that young adults are dying is the worst news within this current onslought of reports. These people just are not traditionally ill. Only testing and autopsies will tell us if the dreaded "cytokine storm" of immune overload is at work here.

People will remind you that there is a ton of respiratory disease and malaise in Mexico. I would counter that we have a whole new subclass of Americans -- immunocompromised Americans with HIV/AIDS, cancer patients undergoing chemotherapy, and other autoimmune diseases. These people especially need to stay very, very close to what is taking place right now.

Regarding the release of antivirals from the SNS: I was fascinated to see the military preposition Tamiflu so quickly (some 7 million courses, or 700,000 boxes of ten capsules). This action tells me that the federal government is itself unsure if this is an early outbreak, or if surveillance broke down and we are a lot further along in this episode than anyone realizes. The absence of data is so glaring, and there is not a doggone thing anyone can do about it until we have more data, better data and good sequencing of the genes of this new virus.

That is key. Labs such as St. Jude need to see this new virus, and see the Mexican clade that is killing people, and see if it is antigenitically the same, or if a mutation occurred that would make the virus more lethal than its American counterpart. In my opinion, this will ultimately decide if borders close, or if travel is curtailed.

This opinion appears to be shared by the WHO itself, in the person of one Keiki Okuda. Here is an excerpt from anew article from Sky News:

Swine Flu Could Become More Dangerous

The swine flu virus that has killed more than 80 people in Mexico may mutate into a "more dangerous" strain, the World Health Organisation has warned. Skip related content

"It's quite possible for this virus to evolve... when viruses evolve, clearly they can become more dangerous to people," said Keiji Fukuda, of the global health watchdog.

Mr Fukuda also called for international vigilance as health experts wait to see whether the virus will turn into a worldwide pandemic.

Over 1,300 people are now thought to have contracted the virulent H1N1 swine influenza after it mutated into a form that spreads from human to human.

The Mayor of New York has confirmed that eight school children are suffering mild symptoms after becoming infected.

And there have been at least 12 other confirmed cases in Texas, Ohio, California and Kansas.

The White House has declared a public health emergency but told the public "not to panic".

Sky US correspondent Greg Milam said: "It's important to realise that those affected have only had mild symptoms, and all have recovered or are recovering.

"But the authorities do believe that this outbreak will get worse."

Canada has become the third country to confirm human cases of swine flu with six people falling ill in Nova Scotia and British Columbia.

Elsewhere in the world, suspected cases have been reported in France, Spain, Israel, New Zealand and the UK.

In France, two people who had returned from Mexico with fevers are being monitored in regions near the port cities of Bordeaux and Marseille.

A 26-year-old Israeli man has also been admitted to hospital after returning from a trip to Mexico with flu-like symptoms.

In Auckland, 10 school children have tested positive for influenza after returning from Mexico.

In the UK, two people have been admitted to a hospital in Scotland after returning from Mexico last week.

They are said to have mild flu-like symptoms but their condition is not causing concern.

Mexican City Mayor Marcelo Ebrard said two more people have died of the virus, taking the death toll to 83.

Overall, I am impressed with the acting head of the CDC, Dr. Richard Besser. He evokes confidence and I think he is believable. Why? Well, for one reason, he wanted to pounce on certain questions and had to restrain his movement until his "handler" -- the White House press secretary -- either gave him a nod ormotioned him toward the podium with a deferential wave of his hand. If this press conference was his audition for the top job at CDC, I think he passed.