Will humidity stem spread of coronavirus? It’s too early to say, but one specialist is hopeful

Will humidity stem spread of coronavirus? It’s too early to say, but one specialist is hopeful


17 Мар 2020 в 08:24am
When President Donald Trump สมัครสมาชิกใหม่ asserted last month that the
novel coronavirus may dissipate “as the heat comes in” --
that is, in warmer weather -- infectious disease experts
responded with skepticism. The virus is less than three

months old and, it’s not สมัครแทงบอลออนไลน์ง่ายๆclear if it will dissipate as
the seasons change from winter to spring like
some other respiratory viruses tend to.
But researchers now suggest that humidity, more than

heat, may prove effective at choking off the person-
to-person transmissions that make the disease’s spread so dangerous.
Dr. Alan Evangelista, a microbiology and virology professor
at St. Christopher’s Hospital for Children in Philadelphia
has studied common บาคาร่าออนไลน์coronaviruses and influenza particles for eight years.
He says his research indicates that “the size and overall
composition of [the novel coronavirus] particle is similar
to other coronaviruses we have tested” -- meaning his

findings may shed light เว็บบาคาร่าออนไลน์on how the coronavirus spreads, and possibly how it dies out.
Those findings show that “transmission is highly
efficient under drier and colder conditions,” but
far less so in a humid environment.
According to the Centers for Disease Control and Prevention,
the novel coronavirus is thought to spread mainly from person-
to-person through respiratory droplets when an infected person
coughs or sneezes. Those droplets can be inhaled into the lungs

or land in the mouths or noses of people nearby. The droplets
are also believed to linger on hard surfaces, which other people might later touch.
“As humidity increases, the viral droplet size is larger
and settles out of the air rapidly,” Evangelista found,

according to a statement he provided to ABC News on his research.
“In contrast, in low humidity, there is rapid evaporation
of respiratory droplets,” he continued. “They remain airborne
for prolonged periods, increasing the time and distance over which transmission can occur.”
Evangelista argues that while “there are obviously no
guarantees that COVID-19 will behave exactly like the
known coronaviruses … the laws of physics should apply.”
While we may expect modest declines in the contagiousness

of [the novel coronavirus] in warmer, wetter weather,”
according to Dr. Marc Lipsitch, a Harvard epidemiologist,
“it is not reasonable to expect these declines alone to
slow transmission enough to make a big dent.”
At least one peer-reviewed 2013 study goes so far as
to suggest the opposite is true -- that extremely humid
conditions are associated with the spread of influenza
viruses in areas closer to the equator.
The empirical evidence available so far is inconclusive,
and at times confusing. The humid stretches of sub-Saharan
Africa have registered a relatively low number positive
cases -- fewer than 150 as of Monday, according to Johns

Hopkins University. But the conditions in such Southeast
Asian countries as Vietnam, where it can at times be humid,
have not appeared to put the brakes on the spread with
more than 1,000 positive tests there so far.
Skeptics also point out that South Florida is quickly
becoming a hot spot for transmissions. Even the mayor
of Miami tested positive for the virus -- though Florida
has not hit its humid season just yet and there isn’t

enough testing being done to get an accurate surveillance of the virus’ spread.
As experts debate the extent to which climate-related
factors can mitigate the spread of the novel coronavirus,
they agree that Americans should not be resting their
“Other epidemiologic factors such as social distancing
and contact tracing, testing, and quarantining, along
with the patient’s immune response will play major roles
in reducing the rate of transmission,” Evangelista wrote,

“and hopefully, we should see a decrease in cases by mid-April.”
As of Monday, more than 4,600 Americans have tested
positive for COVID-19, the disease caused by the novel
coronavirus, and the disease has taken the lives of at


6 Май 2020 в 11:01pm