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ChAdOx1
ChAdOx1 is an adenoviral vector for vaccines that was developed by the Jenner Institute, University of Oxford. The vector is a chimpanzee adenovirus modified to avoid its replication. Adenoviruses are effective vectors for inducing and boosting cellular immunity to encoded recombinant antigens. However, the widespread seroprevalence of neutralizing antibodies to common human adenovirus serotypes limits their use. Simian adenoviruses do not suffer from the same disadvantages. Therefore, investigators have tested new vaccines using the chimp adenovirus ChAdOx1 as a vector. For example, a vaccine for influenza infection was designed using the vector expressing influenza antigens, nucleoprotein (NP), and matrix protein 1 (M1), creating a vaccine candidate named ChAdOx1 NP+M1. __TOC__ Virology ChAdOx1 has been derived from a chimpanzee adenovirus (ChAd) serotype Y25 engineered by λ red recombination to exchange the native E4 orf4, orf6 and orf6/7 genes for those from human adeno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viral Vector Vaccine
A viral vector vaccine is a vaccine that uses a viral vector to deliver genetic material (DNA) that can be transcribed by the recipient's host cells as mRNA coding for a desired protein, or antigen, to elicit an immune response. , six viral vector vaccines, four COVID-19 vaccines and two Ebola vaccines, have been authorized for use in humans. Understanding viral vectors History The first viral vector was introduced in 1972 through genetic engineering of the SV40 virus. A recombinant viral vector was first used when a hepatitis B surface antigen gene was inserted into a Vaccinia, vaccinia virus. Subsequently, other viruses including Adenoviridae, adenovirus, adeno-associated virus, retrovirus, cytomegalovirus, sendai virus, and lentiviruses have been designed into vaccine vectors. Vaccinia virus and adenovirus are the most commonly used viral vectors because of robust immune response it induces. The incorporation of several viruses in vaccination schemes has been investigated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
COVID-19 Vaccine
A COVID19 vaccine is a vaccine intended to provide acquired immunity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes coronavirus disease 2019 ( COVID19). Knowledge about the structure and function of previous coronaviruses causing diseases like severe acute respiratory syndrome ( SARS) and Middle East respiratory syndrome ( MERS) accelerated the development of various vaccine platforms in early 2020. In 2020, the first COVID19 vaccines were developed and made available to the public through emergency authorizations and conditional approvals. However, immunity from the vaccines wanes over time, requiring people to get booster doses of the vaccine to maintain protection against COVID19. The COVID19 vaccines are widely credited for their role in reducing the spread of COVID19 and reducing the severity and death caused by COVID19. Many countries implemented phased distribution plans that prioritized those at highest risk of comp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adenovirus
Adenoviruses (members of the family ''Adenoviridae'') are medium-sized (90–100 nm), nonenveloped (without an outer lipid bilayer) viruses with an icosahedral nucleocapsid containing a double-stranded DNA genome. Their name derives from their initial isolation from human adenoids in 1953. They have a broad range of vertebrate hosts; in humans, more than 50 distinct adenoviral serotypes have been found to cause a wide range of illnesses, from mild respiratory infections in young children (the common cold) to life-threatening multi-organ disease in people with a weakened immune system. Virology Classification This family contains the following genera: * '' Aviadenovirus'' * '' Barthadenovirus'' * '' Ichtadenovirus'' * ''Mastadenovirus'' (including all human adenoviruses) * '' Siadenovirus'' * '' Testadenovirus'' Diversity In humans, currently there are 88 human adenoviruses (HAdVs) in seven species (Human adenovirus A to G): * A: 12, 18, 31 * B: 3, 7, 11, 14, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nipah Virus
Nipah virus (''Henipavirus nipahense'') is a bat-borne, Zoonosis, zoonotic virus that causes Nipah virus infection in humans and other animals, a disease with a very high mortality rate (40-75%). Numerous disease outbreaks caused by Nipah virus have occurred in South East Africa and Southeast Asia. Nipah virus belongs to the genus ''Henipavirus'' along with the Hendra virus, which has also caused disease outbreaks. Virology Like other henipaviruses, the Nipah virus genome is a single (non-segmented) negative-sense, single-stranded RNA of over 18 kb, which is substantially longer than that of other Paramyxoviridae, paramyxoviruses. The viral envelope, enveloped virus particles are variable in shape, and can be filamentous or spherical; they contain a helical nucleocapsid. Six structural proteins are generated: N (nucleocapsid), P (phosphoprotein), M (matrix), F (fusion), G (glycoprotein) and L (RNA polymerase). The ''P'' open reading frame also encodes three nonstructural pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sarah Gilbert
Dame Sarah Catherine Gilbert FRS (born April 1962) is an English vaccinologist who is a Professor of Vaccinology at the University of Oxford and co-founder of Vaccitech. She specialises in the development of vaccines against influenza and emerging viral pathogens. She led the development and testing of the universal flu vaccine, which underwent clinical trials in 2011. In January 2020, she read a report on ProMED-mail about four people in China suffering from a strange kind of pneumonia of unknown origin in Wuhan. Within two weeks, a vaccine had been designed at Oxford against the new pathogen, which later became known as COVID-19. On 30 December 2020, the Oxford–AstraZeneca COVID-19 vaccine she co-developed with the Oxford Vaccine Group was approved for use in the UK. More than 3billion doses of the vaccine were supplied to countries worldwide. Early life and education Sarah Catherine Gilbert was born in Kettering, Northamptonshire. Her father was an office manager for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle East Respiratory Syndrome
Middle East respiratory syndrome (MERS) is a viral respiratory infection caused by '' Middle East respiratory syndrome–related coronavirus'' (MERS-CoV). Symptoms may range from none, to mild, to severe depending on age and risk level. Typical symptoms include fever, cough, diarrhea, and shortness of breath. The disease is typically more severe in those with other health problems. The first case was identified in June 2012 by Egyptian physician Ali Mohamed Zaki at the Dr. Soliman Fakeeh Hospital in Jeddah, Saudi Arabia, and most cases have occurred in the Arabian Peninsula. Over 2,600 cases have been reported as of January 2021, including 45 cases in the year 2020. About 35% of those who are diagnosed with the disease die from it. Larger outbreaks have occurred in South Korea in 2015 and in Saudi Arabia in 2018. MERS-CoV is a virus in the coronavirus family believed to be originally from bats. However, humans are typically infected from camels, either during direct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andrew Pollard (biologist)
Sir Andrew John Pollard (born 29 August 1965) is the Ashall Professor of Infection & Immunity at the University of Oxford and a Fellow of St Cross College, Oxford. He is an honorary consultant paediatrician at John Radcliffe Hospital and the director of the Oxford Vaccine Group. He is the chief investigator on the University of Oxford COVID-19 Vaccine (ChAdOx-1 n-CoV-19) trials and has led research on vaccines for many life-threatening infectious diseases, including typhoid fever, Neisseria meningitidis, ''Haemophilus influenzae'' type b, streptococcus pneumoniae, pertussis, influenza, rabies, and Ebola. Because "In order to prevent any perceived conflict of interest it was agreed that the Joint Committee on Vaccination and Immunisation (JCVI) Chair (Professor Andrew Pollard), who is involved in the development of a SARS-CoV-2 vaccine at Oxford, would recuse himself from all JCVI COVID-19 meetings", JCVI Deputy Chair Professor Anthony Harnden acts in his stead on these matter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
COVID-19 Pandemic
The COVID-19 pandemic (also known as the coronavirus pandemic and COVID pandemic), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), began with an disease outbreak, outbreak of COVID-19 in Wuhan, China, in December 2019. Soon after, it spread to other areas of Asia, and COVID-19 pandemic by country and territory, then worldwide in early 2020. The World Health Organization (WHO) declared the outbreak a public health emergency of international concern (PHEIC) on 30 January 2020, and assessed the outbreak as having become a pandemic on 11 March. COVID-19 symptoms range from asymptomatic to deadly, but most commonly include fever, sore throat, nocturnal cough, and fatigue. Transmission of COVID-19, Transmission of the virus is often airborne transmission, through airborne particles. Mutations have variants of SARS-CoV-2, produced many strains (variants) with varying degrees of infectivity and virulence. COVID-19 vaccines were developed rapidly and deplo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coronavirus Disease 2019
Coronavirus disease 2019 (COVID-19) is a contagious disease caused by the coronavirus SARS-CoV-2. In January 2020, the disease spread worldwide, resulting in the COVID-19 pandemic. The symptoms of COVID‑19 can vary but often include fever, fatigue, cough, breathing difficulties, loss of smell, and loss of taste. Symptoms may begin one to fourteen days after exposure to the virus. At least a third of people who are infected do not develop noticeable symptoms. Of those who develop symptoms noticeable enough to be classified as patients, most (81%) develop mild to moderate symptoms (up to mild pneumonia), while 14% develop severe symptoms ( dyspnea, hypoxia, or more than 50% lung involvement on imaging), and 5% develop critical symptoms ( respiratory failure, shock, or multiorgan dysfunction). Older people have a higher risk of developing severe symptoms. Some complications result in death. Some people continue to experience a range of effects ( long COVID) for mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chikungunya
Chikungunya is an infection caused by the chikungunya virus (CHIKV). The disease was first identified in 1952 in Tanzania and named based on the Kimakonde words for "to become contorted". Chikungunya has become a global health concern due to its rapid geographic expansion, recurrent outbreaks, the lack of effective antiviral treatments, and potential to cause high morbidity. Chikungunya virus is closely related to O'nyong'nyong virus (ONNV), which shares similar genetic and clinical characteristics. Symptoms include fever and joint pain. These typically occur two to twelve days after exposure. Other symptoms may include headache, muscle pain, joint swelling, and a rash. Symptoms usually improve within a week; however, occasionally the joint pain may last for months or years. The risk of death is around 1 in 1,000. The very young, old, and those with other health problems are at risk of more severe disease. The virus is spread between people by two species of mosquitos in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zika Virus
Zika virus (ZIKV; pronounced or ) is a member of the virus family ''Flaviviridae''. It is spread by daytime-active ''Aedes'' mosquitoes, such as '' A. aegypti'' and '' A. albopictus''. Its name comes from the Ziika Forest of Uganda, where the virus was first isolated in 1947. Zika virus shares a genus with the dengue, yellow fever, Japanese encephalitis, and West Nile viruses. Since the 1950s, it has been known to occur within a narrow equatorial belt from Africa to Asia. From 2007 to , the virus spread eastward, across the Pacific Ocean to the Americas, leading to the 2015–2016 Zika virus epidemic. The infection, known as Zika fever or Zika virus disease, often causes no or only mild symptoms, similar to a very mild form of dengue fever. While there is no specific treatment, paracetamol (acetaminophen) and rest may help with the symptoms. Zika can spread from a pregnant woman to her baby. This can result in microcephaly, severe brain malformations, and other b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phases Of Clinical Research
The phases of clinical research are the stages in which scientists conduct experiments with a health intervention to obtain sufficient evidence for a process considered effective as a medical treatment. For drug development, the clinical phases start with testing for drug safety in a few human subjects, then expand to many study participants (potentially tens of thousands) to determine if the treatment is effective. Clinical research is conducted on drug candidates, vaccine candidates, new medical devices, and new diagnostic assays. Description Clinical trials testing potential medical products are commonly classified into four phases. The drug development process will normally proceed through all four phases over many years. When expressed specifically, a clinical trial phase is capitalized both in name and Roman numeral, such as "Phase I" clinical trial. If the drug successfully passes through Phases I, II, and III, it will usually be approved by the national regulatory aut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
