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If she (the infected nurse) was showing symptoms, how is it that she was able to perform her duties?
But this is just my opinion.
originally posted by: intrptr
a reply to: soficrow
You keep missing the point - and the important info - 'cuz you did not read to the end of my post. If you want to keep arguing basic science, you'll lose.
The point I am trying to get you to back off making is that it is not transmissible until symptoms show. it is erroneous and misleading.
If you got it, you can give it.
Are colds and the flu most contagious before or after you start showing symptoms?
Myths about contagion are a regular part of life. Remember when AIDS could be transmitted by a handshake? Most fictions regarding how you can catch diseases aren't quite that bizarre and off the mark -- they usually sound pretty reasonable, which is how a lot of them get passed through generations as unquestioned truths. Many of us understand that when it comes to a cold or the flu, we're most contagious before we start feeling sick; that by the time we've got a runny nose, sore throat and achy muscles, the damage to the people around us has already been done. In fact, many of us are completely wrong.
If you think about how a virus works, it makes sense that we're most contagious when our symptoms are at their worst. Viruses like influenza and those that cause the common cold (there are a couple of hundred of them) have an incubation period once they get into your body. The virus gets into a group of healthy cells and then goes about requisitioning their survival apparatus from the inside. During this incubation period, while the virus is multiplying inside those infected cells, you have no symptoms -- no sore throat, no runny nose, no achy muscles -- and no virus spreading like wildfire throughout your body so that every drop of saliva or mucous you produce contains it. And that's how a virus spreads from one person to another: By a healthy person coming into contact with the bodily fluids of an infected person, whether those fluids are airborne (as from a sneeze) or left on a doorknob by a sick person who just wiped his nose. So if you have no symptoms yet, it's a lot less likely that you're going to spread the virus to another person.
Once the cells that have been taken over by the virus start to die, that's when all hell breaks loose. Here's when you start having symptoms, and you start spreading it to everyone you know if you're not careful. Some of those symptoms are caused by the virus itself (runny nose and sore throat, for example), and others are caused by your immune system(fever and exhaustion, for instance). When the virus breaks out of those dead cells and starts infecting tons of other cells throughout your body, your immune system recognizes that something is wrong and begins its counterattack. All of this can take days to happen. With the flu in particular, the time between exposure and the onset of symptoms is usually between one and four days.
So, when are you most contagious? Most experts agree that adults with a cold or the flu start being contagious about a day before they start experiencing symptoms. For the flu, the contagious period then lasts five to seven days into the illness. For children, the contagious period for the flu can last up to two weeks after they start feeling sick, even if they start feeling better before that. The contagious period for a cold lasts about three to four days into the illness. As a general rule, people with a cold are most contagious about three days after their initial exposure to the virus.
Replication, Pathogenicity, Shedding, and Transmission of Zaire ebolavirus in Pigs
....Results. Following mucosal exposure, pigs replicated ZEBOV to high titers (reaching 107 median tissue culture infective doses/mL), mainly in the respiratory tract, and developed severe lung pathology. Shedding from the oronasal mucosa was detected for up to 14 days after infection, and transmission was confirmed in all naive pigs cohabiting with inoculated animals.
Conclusions. These results shed light on the susceptibility of pigs to ZEBOV infection and identify an unexpected site of virus amplification and shedding linked to transmission of infectious virus.
.........There is increasing experimental evidence indicating that the Ebola virus glycoprotein can mediate entry from the apical side into intact airway epithelia of mouse, nonhuman primate, or human origin [28, 30–32]. The presence of Ebola antigens was also detected in the respiratory mucosa, alveoli, and pulmonary lymphatic tissue of nonhuman primates following aerosolized Ebola challenge, demonstrating that the virus can infect nonhuman primates through mucosal exposure with ebolavirus .
.....These studies underline some differences in the pathology induced by ZEBOV in pigs, compared with nonhuman primates and humans. In contrast to the severe systemic syndrome often leading to shock and death in primates, pigs developed a respiratory syndrome that could be mistaken for other porcine respiratory diseases.
....These data also have implications for the management of human outbreaks following accidental or hypothetically intentional exposure of pigs to Ebola virus.(!)
it makes sense that we're most contagious when our symptoms are at their worst.
So if you have no symptoms yet, it's a lot less likely that you're going to spread the virus to another person.
[–]ELasry[S] 111 points 2 days ago
To woody121: Thank you! No reason why Ebola should mutate to an airborne virus. It survives in body fluids, but not on dry surfaces due to it's lipid membrane.
Furthermore, the disease presented in a somewhat different way, with less hemorrhagic symptoms initially, and a lot of gastrointestinal symptoms, mimicking gastroenteritis for which less methods of infection control would be put in place. The health systems of these countries were already very weak, sometimes supplies are in shortage (even gloves), making infection control even more difficult.
originally posted by: darkbake
I wonder if 500,000 is too high of an estimate for the end of the year? Although the virus is spreading into densely-populated areas... that is a big jump, in my opinion.
But what I am seeing is that people in charge are panicking - I'm not sure if anything productive is going to be done to stop the virus before it continues spreading.
The fatality rate is 90%, which is what makes the virus scary. That, and it is brutal.