After reading the paragraph below, answer the questions that follow.
Before traveling to different countries, you may be vaccinated against diseases that you may not normally encounter in your home country. Suppose that you are going to travel to a country that experiences a smallpox outbreak. While you have traveled to this country in the past and thus have received smallpox vaccine, you are required to get a second smallpox vaccine in order to fully protect you from smallpox.
The second vaccination is beneficial because it
◦ contains mast cells that survive longer than 4-5 days.
◦ stimulates production of a higher concentration of antibodies in the bloodstream.
◦ keeps previously produced cytotoxic T cells circulating in the bloodstream.
◦ requires two injections to stimulate antibody formation.
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June’s bike shop Grade 1 Reading