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22

Definitely. The CDC's website has a list of vaccines used in the USA sorted by disease; you'll notice that many diseases have more than one vaccine. Note that some vaccines are variations of each-other, but some are clearly distinct vaccines with different active ingredients, for example those approved for Typhoid; Vivotif, taken orally, and TYPHIM Vi, ...


6

Certainly. Notable examples include the Salk & Sabin vaccines for polio, and Shingrix & Zostavax vaccines for shingles. This is just off the top of my head, so a little research might turn up other examples.


5

According to LabCorp spokesman Mike Geller, because those states have bans on the use of home testing kits: The test's website says it will not be available in New York, New Jersey, Maryland and Rhode Island. Those states are excluded because they have regulations against patients initiating their own lab tests, Geller said. New York and New Jersey ...


1

There are several lines of vaccines for flu. Two were developed simultaneously for Shingles. On flu it depends on the year which ones are available and approved. On shingles, one made it to market first, but the second one proved more effective and became the preferred vaccine. As of the candidate process, often many vaccine lines are developed in ...


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