Jennifer Rigby 17
hrs ago
Covid-19 deaths have started to rise again around the world
as the third wave of the virus takes hold amid warnings that - for some
countries - the “worst is yet to come”.
The resurgence of the pandemic, after a sustained lull earlier this year , is being driven by
particularly horrifying numbers in parts of the world like Brazil.
The country reported 3,000 daily deaths on Tuesday and is
close to reaching 300,000 deaths in total from the virus, a toll surpassed only
by the United States.
“We are close to or facing a catastrophe,” a bulletin from
the Brazilian medical research institution, Fiocruz, read last week, adding that intensive care occupancy is
above 90 per cent across half of its 26 states . The country’s health system
is “living through the worst collapse in history”, it added.
Brazil’s leader President Jair Bolsonaro has repeatedly
played down the threat of coronavirus, and a televised address on the country’s
deadliest day so far was reportedly greeted with screams of “liar” and “murderer” in the country’s biggest
cities.
And while Brazil is currently the epicentre of the latest
resurgence of coronavirus, the picture is worrying in a number of other
regions, according to the World Health Organization’s weekly epidemiological report.
After six weeks of declining numbers of fatalities, the
death rate rose by three per cent globally in the last seven days, to 60,414 in
total.
Cases have been rising since the beginning of March, and
this rise continued in the past week, too, WHO said, with just under 3.3
million new cases reported.
There was a “marked increase” in cases reported from
South-East Asia, Europe, the Eastern Mediterranean and Western Pacific regions,
the WHO added, and there are “concerning trends” in some countries in the
African and Americas regions too.
Given the unequal roll-out of vaccinations around the globe , the
ongoing impact of new, more transmissible variants of the virus, and reluctance
in many countries to shut down entirely once again, cases and death rates are
likely to continue to climb.
Already, the only region to see a decline in new deaths
last week was the Western Pacific, where deaths fell by nearly a third on the
previous seven days.
The picture within regions remains uneven, however, with declining cases and deaths in badly-hit countries including
the UK and the United States , both of which have undertaken speedy
vaccination drives.
Public health experts said that the numbers showed that the
worst of Covid-19 is far from behind us globally.
Professor Adam Kucharski, an infectious disease
epidemiologist at the London School of Hygiene and Tropical Medicine, tweeted the following on Wednesday , accompanied by a
graph of Brazil’s rapidly escalating daily death toll: “The worst of the
pandemic is likely over in a (relatively small) number of places, but in
others, there are troubling signs it’s yet to come.”
India, the eastern Mediterranean and much of east and
Central Europe are also posting worrying numbers, the WHO said.
The picture in parts of South Asia is worsening
particularly rapidly, the data shows.
Last week, Bangladesh posted an 86 per cent rise in the
number of new deaths, with 141 new fatalities. Deaths in India also rose by 35
per cent, to 1,148 new Covid-19 deaths in the last seven days.
Other countries including Jordan, Italy and Poland
also saw dramatic rises in the numbers of Covid-19 deaths last week.
In total, there have been more than 122 million coronavirus
cases and at least 2.7 million deaths since the pandemic began.
https://www.msn.com/en-gb/news/world/covid-deaths-on-the-rise-again-globally-amid-warning-worst-yet-to-come-for-some-countries/ar-BB1eURko
Emerging evidence links COVID-19
with tinnitus and hearing problems
By Rich Haridy March 23, 2021
A new systematic review
investigating published research on the relationship between COVID-19 and hearing
problems is suggesting a number of audio-vestibular symptoms can be associated
with the disease. The review found hearing loss, tinnitus and vertigo can all
be associated with COVID-19 and the researchers are currently conducting a
year-long study to better understand the long-term effects of the disease on
hearing.
Kevin Munro and Ibrahim Almufarrij,
audiologists from the University of Manchester, first conducted a rapid systematic review into the links
between COVID-19 and hearing problems last year. The rapid review looked at the
first few months of research and case reports emerging in the early days of the
pandemic.
The initial review found
audio-vestibular symptoms were rarely reported in early COVID-19 cases, but the
researchers did note it was potentially too soon to uncover hearing problems
that may only arise over longer periods of time. Now, a year later, the
researchers have updated their systematic review finding multiple cases of
hearing problems have now been reported.
The new systematic review
encompasses 28 case reports and 28 cross-sectional studies. A pooled data
analysis revealed 7.6 percent of COVID-19 cases report hearing loss, 7.2
percent report vertigo and 14.8 percent report
Both Munro and Almufarrij are clear in noting the evidence
evaluated in their latest review is based on anecdotal reports and
self-reported symptoms. So it is not at all clear if this burgeoning
association is causally connected.
“It is important not to diagnose audio-vestibular symptoms
where they do not exist or where they are coincidental, given the high rates of
COVID-19 in the population,” notes Munro in a recent piece for The Conversation . “However, the findings of the review
might simply reflect the start of our understanding of this emergent health
condition.”
Tinnitus, for example, is a symptom increasingly linked to long COVID . As well as patients reporting
COVID-19 exacerbating their pre-existing tinnitus, some believe the disease
could initiate the appearance of tinnitus.
Munro suggests tinnitus is a condition that can appear for
a number of reasons, from actual ear damage caused by noise or infection, to
psychological triggers such as stress and anxiety. So although there may be
reasonable hypotheses demonstrating how SARS-CoV-2 could directly damage one’s
hearing, he says the current evidence is not of a good enough quality to prove
causality.
“It is possible the virus attacks and damages the auditory
system,” suggests Munro. “On the other hand, the mental and emotional stress of
the pandemic may be the trigger. But we need to be careful when interpreting
these findings as it’s not always clear if studies are reporting existing or
new symptoms. What is lacking are good-quality studies that compare tinnitus in
people with and without COVID-19.”
Hoping to fill that gap in the knowledge, a year-long study
is underway tracking COVID-19 patients after discharge from hospital. Munro is
leading the study and hopes the work will offer robust insight into the
relationship between hearing problems and COVID-19.
The new study was published in the International Journal of Audiology .
https://newatlas.com/health-wellbeing/covid19-tinnitus-hearing-loss-coronavirus-study-manchester/
The Latest: Pakistan orders doses
of Chinese-made vaccines
By The
Associated Press March 24, 2021
ISLAMABAD-- Pakistan’s top health official said
Wednesday his country will purchase 1 million doses of China’s Sinopharm
vaccine and 60,000 doses of the vaccine made by Chinese company CanSino
Biologics.
Faisal Sultan, a special assistant to the prime
minister, said on Twitter that an order has been placed for the purchase of
Chinese-made vaccines which will be delivered to Pakistan within days.
The purchases will be in addition to 1.5
million doses of vaccine which China is donating to Pakistan in phases.
Without giving more details, Sultan said
Pakistan will also receive several million doses of vaccines in April.
Pakistan is currently facing a third wave of
coronavirus infections.
Also Wednesday, Education Minister Shafqat
Mahmood said the government is ordering the closure of schools in the capital,
Islamabad and in several high-risk cities until April 11.
Pakistan has reported 637,042 virus cases and
13,965 deaths from coronavirus since last year.
https://apnews.com/article/pakistan-islamabad-coronavirus-pandemic-africa-china-465784cd5d3a075686252c2c5072c9a3
India health officials identify
double mutant COVID-19 variant
March 24, 2021 / 5:27 AM
March 24 (UPI) -- India's ministry of health announced Wednesday officials have
discovered a new variant of the COVID-19 virus with two mutations as well as hundreds other
infections caused by other known variants of concern first found in Britain,
South Africa and Brazil.
"Though VOCs and a new double mutant variant have been
found in India, these have not been detected in numbers sufficient to either
establish or direct relationship or explain the rapid increase in cases in some
states," the ministry said in a statement . "Genomic sequencing and epidemiological
studies are continuing to further analyze the situation."
The double mutant variant was
discovered in samples from western Maharashtra state, it said, explaining the
mutations "confer immune escape and increased infectivity."
These mutations have been found in
between 15-20% of samples and do not match any previously cataloged variants of
concern, it said.
The Indian SARS-CoV-2 Consortium on
Genomics discovered the variant as it has been conducting genomic sequencing
and analysis of COVID-19 samples since it was founded on Dec. 25.
Since then, it has discovered 771
variants of concern from among fewer than 11,000 samples shared by states.
Of the variants, the sequencing
identified 736 cases of the B.1.1.7 variant first discovered in Britain, 34
cases of the South African B.1.351 variant and one case of the Brazilian P.1
variant, it said.
The discovery of the double mutant variant was announced as
the the ministry reported 47,262 infections diagnosed in the past 24 hours,
the highest number since nearly 48,000 cases were reported on Nov. 11. The
increase is a continuing trend from a low of about 12,000 cases a day in early
February.
India has the third most infections in the world at 11.7
million behind only Brazil with 12.1 million and the United States with 29.9
million, according to data collected by Johns
Hopkins University.
More
https://www.upi.com/Top_News/World-News/2021/03/24/India-health-officials-identify-double-mutant-COVID-19-variant/7761616574591/
Next, some vaccine links
kindly sent along from a LIR reader in Canada. The links come from a most
informative update from Stanford Hospital in California.
World
Health Organization - Landscape of COVID-19 candidate vaccines . https://www.who.int/publications/m/item/draft-landscape-of-covid-19-candidate-vaccines
NY
Times Coronavirus Vaccine Tracker . https://www.nytimes.com/interactive/2020/science/coronavirus-vaccine-tracker.html
Stanford
Website . https://racetoacure.stanford.edu/clinical-trials/132
Regulatory
Focus COVID-19 vaccine tracker . https://www.raps.org/news-and-articles/news-articles/2020/3/covid-19-vaccine-tracker
Some other useful Covid links.
Johns Hopkins Coronavirus
resource centre
https://coronavirus.jhu.edu/map.html
Rt Covid-19
https://rt.live/
Centers for Disease Control
Coronavirus
https://www.cdc.gov/coronavirus/2019-ncov/index.html
The Spectator
Covid-19 data tracker (UK)
https://data.spectator.co.uk/city/national
Technology Update.
With events happening
fast in the development of solar power and graphene, I’ve added this section.
Updates as they get reported.
Moiré effect: How to twist
material properties
Date: March 23, 2021
Source: Vienna University of Technology
Summary: 2D materials like graphene have
revolutionized materials science. Now a new interesting option has been added
to this field of research: Two thin material layers can be stacked and twisted
by a certain angle. This leads to a Moiré-effect and changes the properties of
the material.
The discovery of the material
graphene, which consists of only one layer of carbon atoms, was the starting
signal for a global race: Today, so-called "2D materials" are
produced, made of different types of atoms. Atomically thin layers that often
have very special material properties not found in conventional, thicker
materials.
Now another chapter is being added
to this field of research: If two such 2D layers are stacked at the right
angle, even more new possibilities arise. The way in which the atoms of the two
layers interact creates intricate geometric patterns, and these patterns have a
decisive impact on the material properties, as a research team from TU Wien and
the University of Texas (Austin) has now been able to show. Phonons -- the
lattice vibrations of the atoms -- are significantly influenced by the angle at
which the two material layers are placed on top of each other. Thus, with tiny
rotations of such a layer, one can significantly change the material
properties.
The Moiré Effect
The basic idea can be tried out at
home with two fly screen sheets -- or with any other regular meshes that can be
placed on top of each other: If both grids are perfectly congruent on top of
each other, you can hardly tell from above whether it is one or two grids. The
regularity of the structure has not changed.
But if you now turn one of the grids
by a small angle, there are places where the gridpoints of the meshes roughly
match, and other places where they do not. This way, interesting patterns
emerge -- that is the well-known moiré effect.
"You can do exactly the same
thing with the atomic lattices of two material layers," says Dr. Lukas
Linhart from the Institute for Theoretical Physics at TU Wien. The remarkable
thing is that this can dramatically change certain material properties -- for
example, graphene becomes a superconductor if two layers of this material are
combined in the right way.
"We studied layers of
molybdenum disulphide, which, along with graphene, is probably one of the most
important 2D materials," says Prof Florian Libisch, who led the project at
TU Wien. "If you put two layers of this material on top of each other,
so-called Van der Waals forces occur between the atoms of these two layers.
These are relatively weak forces, but they are strong enough to completely
change the behaviour of the entire system."
In elaborate computer simulations,
the research team analysed the quantum mechanical state of the new bilayer
structure caused by these weak additional forces, and how this affects the
vibrations of the atoms in the two layers.
----The
material-physical Moiré effect thus makes the already rich research field of 2D
materials even richer -- and increases the chances of continuing to find new
layered materials with previously unattainable properties and enables the use
of 2D materials as an experimental platform for quite fundamental properties of
solids.
More
https://www.sciencedaily.com/releases/2021/03/210323131238.htm?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+sciencedaily%2Fmatter_energy%2Fgraphene+%28Graphene+News+--+ScienceDaily%29
There are basically two types of people. People who accomplish
things, and people who claim to have accomplished things. The first group is
less crowded.
Mark Twain.
Happily,
I am in the more crowded group.
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