Reasoning: and since it is not effective until a month after vaccination, administering it after an outbreak begins helps very little. Conclusion: Nevertheless, experts predict that use of the vaccine will increase significantly within the next few years. it means that vaccines must be used at least one month before the outbreak. the supporting answer must be able to tell, the experts now must be able to (but couldn't in the past) predict the outbreak and use the vaccine at least one month before it happens. |