Earlier today I saw this tweet in the #Ebola feed:
This is not the first time I've heard the rumour; it's been on and off Twitter for several weeks. It tends to be picked up by people who express support for President Trump and building his wall, and is of course cited as a good reason to finish building the wall. When I asked Mr. Kolfage if his source with the Department of Homeland Security is trustworthy, he replied, "Very, very trusted."
That's insufficient evidence. For Ebola to turn up in northern Mexico as described, a chain of highly unlikely events would have to occur:
- At least nine persons in North Kivu or Ituri are exposed to Ebola. In the following 21 days, they leave the region and journey to Mexico, perhaps via Kinshasa or Kampala, with connecting flights via one or more European airports.
- The nine persons travel through several checkpoints, both inside the DR Congo and at numerous air terminals, where travellers' temperatures are taken. (Over 60 million crossings into Uganda, Rwanda, or South Sudan have been so checked; I believe seven of them were considered potential cases but I don't know their test results.)
- For unknown reasons, these affluent, passport-bearing Congolese then try to enter the US as migrants through the Mexican border at El Paso and Laredo, rather than, say, flying directly to an American destination like Dallas (where the Liberian Thomas Eric Duncan arrived, with both visa and Ebola, in 2014).
- By now, however, they are definitely running a fever and perhaps showing other symptoms. DHS or ICE personnel at the border order tests and in the meantime detain the nine persons—perhaps in facilities shared with other detainees.
- Medical tests confirm Ebola, and the nine persons are placed in isolation in a facility able to deal with such cases, like the University of Nebraska Medical Center. It's not at all clear that any hospital in Laredo is equipped or trained for such a case, let alone nine of them.
- Since it's a notifiable disease, the laboratory would presumably advise the CDC and the Texas Health Department, not to mention the health officials in Tamaulipas state and Mexico City. Such notification would trigger waves of contact tracing as the Congolese travellers' movements since arriving in Mexico would be exhaustively studied.
- The US border officials (and other migrants) who had contact with these persons would themselves be monitored for 21 days in quarantine along with their families.
- This response would involve a great deal of publicity. The CDC would expect to be closely consulted, and would of course notify other agencies like the Public Health Agency of Canada, ECDC, and WHO. The US media would go to battle stations, just as they did about Duncan in 2014. Twitter would have far, far more about it than we now see.
- The Laredo and El Paso public schools would notify their communities that some pupils, the children of potentially infected border personnel, were being monitored in quarantine. The schools would likely be closed for 21 or 42 days.
- The original case or cases, meanwhile, would die or recover. Even assuming their cases had been identified early and treatment had been good, three of them would likely have died.
Admittedly, this is a very far-fetched scenario. But it's even more unlikely to suppose that nine confirmed Ebola cases, whether in the US or Mexico, could be kept secret and then revealed only by a "very, very trusted" person in the DHS. Such secrecy would entail cooperation from people who are professionally and legally bound to go public with it, all the way from Laredo lab technicians to the head of the CDC.
It's even harder to imagine President Trump keeping such a secret, when he has been warning of threats from south for years. (He also wanted American doctors fighting Ebola in West Africa to be barred from returning home.)
So until we get confirmation from a very, very reliable source like the CDC, we can treat this story with the old Scottish verdict: "not proven." Or simply dismiss it with the old American term: "fake news."
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