Exercise 9. Fill in the gaps with appropriate preposition:
In, at, on (2), against, for, during, with, among
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The influenza vaccine is an annual vaccine to protect … the highly variable influenza virus.
Influenza vaccination is the most effective method … preventing influenza virus infection and its potentially severe complications.
Vaccines are used not only … humans.
Vaccination is associated … reductions in influenza-related respiratory illnesses, hospitalization and death among persons … high risk, otits media … among children.
Although influenza vaccination levels increased substantially … the 1990s, further improvements in vaccine coverage levels are needed.
Inproved influenza countermeasures require basic research … how viruses enter cells, replicate, mutate, and evolve into new strains.
Many groups worldwide are working … a universal flu vaccine that will not need changing each year.
Exercise 10. Put questions to the underlined words:
The earliest existing descriptions of influenza were written nearly 2.500 year ago by ancient Greek physician Hippocrates.
Individuals who suffer from frequent flu and colds often tend to have bronchitis.
Influenza is characterized by high fever, chills, chest pain, and productive cough with yellowish green sputum.
A worldwide seasonal influenza epidemic kills 250.000 to 500.000 people each year.
The rapid development, production, and distribution of pandemic influenza vaccines saved millions of lives during influenza pandemics.
Most people completely recover from influenza infection within 2 weeks.
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