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A SARS vaccine could be used among high-risk groups in China in the event of a large-scale outbreak again this spring, say experts.
The inactivate vaccine was produced last May following a year of intense research to find a vaccine for the virus which sparked a global health scare when it emerged in early 2003.
Trials among 36 volunteers have proved effective and safe in the first-phase human tests begun on May 22, 2004, said Yin Weiping, managing director of Beijing-based Sinovac Biotech Co Ltd which has produced the vaccine.
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The second-round of tests will involve further experimental verification in many aspects, such as dosage and schedule for injecting the vaccine to gain a better understanding of it and how it can best be used.
A date for beginning the second-round of tests has not been fixed, while the third-round of trials will necessarily involve hundreds of volunteers in the event of another large-scale SARS outbreaks, Yin Weiping noted.
Several reports have showed that SARS-CoV inactivated with formaldehyde, UV light, and β-propiolactone can induce virus-neutralizing antibodies in immunized animals (8–11), and the first inactivated SARS-CoV vaccine is being tested in the clinical trials in China. However, safety of the inactivated vaccine is a serious concern; production workers are at risk for infection during handling of concentrated live SARS-CoV, incomplete virus inactivation may cause SARS outbreaks among the vaccinated populations, and some viral proteins may induce harmful immune or inflammatory responses, even causing SARS-like diseases
The S protein of FIPV expressed by recombinant vaccinia can cause antibody-dependent enhancement of disease if vaccinated animals are subsequently infected with wild-type virus (32). Our previous studies on HIV-1 showed that antibodies against some immunodominant epitopes in the HIV-1 envelope glycoprotein could enhance infection by heterologous HIV-1 strains (33). Most recently, Yang et al. (6) demonstrated that the polyclonal and monoclonal antibodies against S protein of the late SARS-CoV (Urbani strain) could neutralize infection by the relevant late SARS-CoV strains. However, these antibodies enhanced infection by an early human SARS-CoV isolate (GD03T0013) and the civet SARS-CoV–like viruses. These investigators have shown that the ACE2-binding domain mediates the antibody-dependent enhancement of civet SARS-CoV–like virus entry (6). Theoretically, some antibodies to the ACE2-binding domain may enhance infection if these antibodies closely mimic the receptor ACE2 and induce similar conformational changes, as the receptor likely does.
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Vaccination of ferrets with MVA-based SARS vaccine expressing full-length S protein caused liver damage after animals were challenged with SARS-CoV (34). These findings raised concerns about the efficacy and safety of the vaccines containing or expressing full-length S protein.
Histopathology seen in animals given one of the SARS-CoV vaccines was uniformly a Th2-type immunopathology with prominent eosinophil infiltration, confirmed with special eosinophil stains. The pathologic changes seen in all control groups lacked the eosinophil prominence.
Conclusions
These SARS-CoV vaccines all induced antibody and protection against infection with SARS-CoV. However, challenge of mice given any of the vaccines led to occurrence of Th2-type immunopathology suggesting hypersensitivity to SARS-CoV components was induced. Caution in proceeding to application of a SARS-CoV vaccine in humans is indicated.
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The eosinophil component of infiltrates was very prominent in animals vaccinated with the experimental vaccine preparations when compared to animals mock-vaccinated using PBS, or those exposed earlier to live virus (figure 6); few to no eosinophils were seen in those lung sections. Thus, while pathology was seen in sections from the control mice, the hypersensitivity-type pathologic reaction with eosinophils was not seen.
Also shown is that a Th2-type immunopathology was seen after challenge of all vaccinated animals when evaluation for immunopathology was reported except the study in hamsters with a GSK whole virus vaccine. Thus, inactivated whole virus vaccines whether inactivated with formalin or beta propiolactone and whether given with our without alum adjuvant exhibited a Th2-type immunopathologic in lungs after challenge. As indicated, two reports attributed the immunopathology to presence of the N protein in the vaccine; however, we found the same immunopathologic reaction in animals given S protein vaccine only, although it appeared to be of lesser intensity. Thus, a Th2-type immunopathologic reaction on challenge of vaccinated animals has occurred in three of four animal models (not in hamsters) including two different inbred mouse strains with four different types of SARS-CoV vaccines with and without alum adjuvant. An inactivated vaccine preparation that does not induce this result in mice, ferrets and nonhuman primates has not been reported.
This effort was hampered by the occurrence in the initial preclinical trial of an immunopathogenic-type lung disease among ferrets and Cynomolgus monkeys given a whole virus vaccine adjuvanted with alum and challenged with infectious SARS-CoV [14]. That lung disease exhibited the characteristics of a Th2-type immunopathology with eosinophils in the lung sections suggesting hypersensitivity that was reminiscent of the descriptions of the Th2-type immunopathologic reaction in young children given an inactivated RSV vaccine and subsequently infected with naturally-occurring RSV [32]–[33]. Most of these children experienced severe disease with infection that led to a high frequency of hospitalizations; two children died from the infection [33], [40], [41]. The conclusion from that experience was clear; RSV lung disease was enhanced by the prior vaccination.
the Th2-type immunopathology pattern was seen only in animals given an inactivated vaccine earlier.
"Compared to the time when there was no SARS vaccine, we now feel much less disquiet with spring approaching, because we now have a powerful weapon," said Dr Lin.
In April 2004, China reported a case of SARS in a nurse who had cared for a researcher at the Chinese National Institute of Virology (NIV). While ill, the researcher had traveled twice by train from Beijing to Anhui province, where she was nursed by her mother, a physician, who fell ill and died. The nurse in turn infected five third-generation cases, causing no deaths.
Subsequent investigation uncovered three unrelated laboratory infections in different researchers at the NIV. At least of two primary patients had never worked with live SARS virus. Many shortcomings in biosecurity were found at the NIV, and the specific cause of the outbreak was traced to an inadequately inactivated preparation of SARS virus that was used in general (that is, not biosecure) laboratory areas, including one where the primary cases worked. It had not been tested to confirm its safety after inactivation, as it should have been.
He was genetically engineering various immune pathways (such as the STING pathway in bats) to make the bats more or less susceptible to infection, in the process potentially creating a highly resistant mutant superbug.
As part of his studies, Peng also researched mutant Coronavirus strains that overcame the natural immunity of some bats; these are "superbug" Coronavirus strains, which are not resistant to any natural immune pathway, and now appear to be out in the wild.
As of mid-November, his lab was actively hiring inexperienced post-docs to help conduct his research into super-Coronaviruses and bat inf
It is clear that the recently discovered bat SL-CoVs
are not the immediate progenitors of SARS-CoV
which caused the outbreaks in 2002/2003[26]. It is
envisaged that the ongoing vaccine against the SARSCoV may not protect the infection by bat SL-CoVs.
Considering the wide distribution and genetic diversity
of bat SL-CoVs in China[18, 20, 25, 33], co-infection of
same bat species by different coronaviruses[18, 20, 30] and
the capability of recombination of coronaviruses[2, 8], it is
likely new coronaviruses in bats that can cross species
to infect humans. Moreover, high density of bat
habitats and increasing contacts between bats and
human will further increase the virus transmission
opportunities from bats to human. So, it is highly
important to be prepared for prevention and control of
the emerging disease resulting from this group of
viruses. The recombinant adenovirus constructed in
this study provides a potential vaccine candidate
against the infection by diverse bat SL-CoVs.
The Law will take effect on December 1, 2019
ARDS is the common immunopathological event for SARS-CoV-2, SARS-CoV and MERS-CoV infections [31]. One of the main mechanisms for ARDS is the cytokine storm, the deadly uncontrolled systemic inflammatory response resulting from the release of large amounts of pro-inflammatory cytokines
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The cytokine storm will trigger a violent attack by the immune system to the body, cause ARDS and multiple organ failure, and finally lead to death in severe cases of SARS-CoV-2 infection, just like what occurs in SARS-CoV and MERS-CoV infection
Staff who had access to the data were also required to sign a “letter of commitment,” which stipulated that officials promise to delete relevant documents from their laptops, computers, smartphones, external drive, and so on.
Furthermore, the signee will delete any screenshots and photos he or she made of the documents, and will promise not to share the contents of said documents with any party.
many large donors have given priority to infectious diseases, to the extent that the WHO’s polio programme acc
Over the past decade, the Bill & Melinda Gates Foundation has been the largest private donor to WHO, whose major contributions had been earmarked for polio eradication through the Global Polio Eradication Initiative (GPEI)
WHO, as the global health governance body, is now dependent more on funding by donors than by member states. About 80% of the WHO budget is financed by donor contributions, and is mostly ear-marked for certain activities.
...
Interestingly, China has committed a new financial contribution to WHO and is strengthening the WHO-China cooperation through the Belt and Road Initiative, announced during the high-level meeting with Dr Tedros Adhanom Ghebreyesus, Director General of WHO, in August 2017.
The global vaccine market is showing some escalating growth and it is expected that it will reach total revenues of nearly 60 billion U.S. dollars by 2020. That would be almost double the size the market had back in 2014. Driver of the growth is the increase of various infectious diseases like influenza, swine flu, hepatitis, tuberculosis, diphtheria, Ebola, and meningococcal and pneumococcal diseases.
Will you get in line for the SARS-CoV 2 Vaccine? Look at SARS 1 Vaccine development.
originally posted by: Oldtimer2
a reply to: SoulReaper hell no but according to letter sent to DOD by our president,all citizens must be vaccinated it was sent 9-19-19 invert those numbers,and the fact it was 4 months before supposed outbreak,this is a red herring for #! financial collapse#2 WW3#3 Trump is last american president,not neccesarily in that order,so it is etched in stone so to speak,welcome to the New World Order,ohh and military will be wearing blue uniforms,by the end of this year,this is unraveling like taking a razor blade to a skinless golfball
originally posted by: IrateCanadian
I can see them pushing this new vaccine as a "Required to work or be in public" type of choice.
I ain't taking it. I stock piled up on firearms and ammo for this very reason.
Taking the fight to them if they try to pull this sh#t
originally posted by: Oldtimer2
a reply to: SoulReaper hell no but according to letter sent to DOD by our president,all citizens must be vaccinated it was sent 9-19-19 invert those numbers,and the fact it was 4 months before supposed outbreak,this is a red herring for #! financial collapse#2 WW3#3 Trump is last american president,not neccesarily in that order,so it is etched in stone so to speak,welcome to the New World Order,ohh and military will be wearing blue uniforms,by the end of this year,this is unraveling like taking a razor blade to a skinless golfball
originally posted by: drussell41
a reply to: SoulReaper
Holy s888. I knew the SARS vaccine was bad; I didn't know it went this badly.