Hilleman noticed news reports of a severe influenza in Hong Kong. The number of cases and their description led him to think that a new type of influenza was emerging and that a pandemic threatened.
Hilleman and his team obtained a sample of the virus from a U. They soon determined that most people lacked antibody protection from the new influenza virus. Only a few elderly people who had survived the influenza pandemic of showed antibody response to the new virus.
Hilleman jump-started vaccine production by sending virus samples to manufacturers and urging them to develop the vaccine in four months. Worldwide, from , about 2 million people died from Asian flu, with about 70, deaths in the United States. Some predicted that the U. Health officials widely credited that vaccine with saving many lives. Which of the following is most likely to lead to a sudden, radical change in the influenza virus?
True or false? The influenza vaccine always remains the same from year to year. Article Menu [ ]. Vaccine Science [ ]. Biological Weapons, Bioterrorism, and Vaccines. Cancer Vaccines and Immunotherapy. Careers in Vaccine Research. Ebola Virus Disease and Ebola Vaccines. Human Cell Strains in Vaccine Development. Identifying Pathogens and Transmission Vectors. Malaria and Malaria Vaccine Candidates. Passive Immunization. The Future of Immunization. Vaccines for Pandemic Threats.
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Influenza Pandemics. The Development of the Immunization Schedule. The History of the Lyme Disease Vaccine. The Scientific Method in Vaccine History. Military and Vaccine History. This system makes things easier to understand and helps prevent misreporting. It also can help eliminate stigmatizing and discriminatory labels that people often use when they refer to variants by their places of origin.
Experts say a particular strain of the delta variant a mutated version of the variant that is more infectious is responsible for the recent surge of cases in the United Kingdom. This strain, B. While research is ongoing, early data also suggests that this particular variant could be one of the driving forces behind the enormous surge in cases — and, subsequently, COVID deaths — in India in the spring. In mid-May, it accounted for only 2. It has caused substantial morbidity.
With the delta variant, the symptoms seem to be a little milder. There have been fewer reports of loss of smell and cough and more reports of symptoms like headache, runny nose, sore throat and fever.
Delta variant symptoms in children have been mild as well. They include:. Viruses mutate constantly. This is especially true of viruses that contain RNA as their genetic material, such as coronaviruses and influenza viruses.
Explain your answer choice. Skip to Main Content Challenge 4: How do mutations cause viral evolution? I can describe relationships between mutations and viral evolution.
I can provide evidence for how viral evolution affects the ability of a virus to infect its host. Estimated Time: 30 minutes.
If the mutant and this new host meet, a spillover can happen. Despite how many viruses exist, relatively few threaten us, and the plants and animals we rely on. Nonetheless, some creatures are especially dangerous on this front. Given the enormous number of viruses that exist, and our willingness to provide them global transport, future spillovers are inevitable.
We can reduce the chances of this by practising better virus surveillance in hospitals and on farms. We should also recognise wildlife, not only for its intrinsic value, but as a potential source of disease-causing viruses.
Portsmouth Climate Festival — Portsmouth, Portsmouth. Edition: Available editions United Kingdom. Become an author Sign up as a reader Sign in.
Steve Wylie , Murdoch University.
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