The world’s biggest COVID9-9 vaccine (疫苗) study started on Monday. A total of 30,00 volunteers will help test the effectiveness and safety of a shot developed by the National Institutes of Health and drug maker Moderna.
The volunteers will each receive two doses (剂量) of a shot. They will not know whether they are getting the real vaccine or false version (版本) Scientists will then closely follow the volunteers as they go about their daily activities. They want to see which group experiences a higher rate of infections (感染), especially in areas where the virus still is spreading unchecked.
Volunteers from more than 80 test areas across the country will take part in the study. Moderna said the first vaccines were given Monday morning in Savannah, Georgia. The U.S. government requires its tests of any vaccine that might be used in the country. The aim is not just to test if a vaccine works, but also to check if it is safe.
Through the government-funded COVID-19 Prevention Network, the U.S. plans a new study for vaccine candidates (候选人) each month through autumn. Each will involve30,000 newly chosen volunteers. The hope is that, by using the same rules for each study, scientists will be easily able to compare the vaccines. In August, the U.S. will carry out its final stages of Oxford University’s vaccine candidate. The study of Johnson & Johnson’s vaccine will start in September. Drug maker Pfizer also plans to carry out its own 30,000-person study this summer.
That is a lot of volunteers needed to test possible vaccines. But in recent weeks, more than 150,000 Americans have registered to volunteer for the studies, says Dr. Larry Corey. He is with the Fred Hutchinson Cancer Research Institute in Seattle, Washington. It normally takes years to create a new vaccine from start to finish. But this time, scientists are setting speed records.
【小题1】What can be learned according to the second paragraph?A.The volunteers will be divided into two groups. |
B.A false version will influence the volunteers poorly. |
C.Every volunteer gets two doses of shot at different times. |
D.Scientists will keep the volunteers in a special place. |
A.This test involves volunteers from different countries. |
B.Some volunteers have been injected with the vaccine. |
C.The aim of the test is to see how the vaccine works. |
D.The U.S. government intends to do tests nationwide. |
A.The tests need many more than 150,000 volunteers |
B.The vaccines made in a hurry have not potential safety issues. |
C.It is hoped that vaccine is the best hope against the virus. |
D.It is better to put off using the vaccines on humans. |
A.COVID-19 Vaccine Starts Test with Volunteers |
B.Moderna Are to Develop COVID-19 Vaccine |
C.150,000 Registered to Get COVID-19 Vaccine |
D.COVID-19 Vaccine Gets Support from U.S. Government |