A primary reason for needing a new vaccine for influenza each year is that there could be mutation of surface proteins leading to a new outbreak
<h3>What is antigenic drift?</h3>
Antigenic drift is a phenomenon that causes small changes or mutations in the genes of influenza viruses leading to changes in their surface proteins of the virus, which are HA (hemagglutinin) and NA (neuraminidase).
For this reason, new influenza vaccines are produced yearly to alter the effects that may emerge as a result.
Thus, a primary reason for needing a new vaccine for influenza each year is that there could be mutation of surface proteins leading to a new outbreak
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There are 2 main processes to test tablet hardness: compression testing and 3 point bend testing. For compression testing, the analyst generally aligns the tablet in a repeatable way, and the tablet is squeezed between a fixed and a moving jaw. The first machines continually applied force with a spring and screw thread until the tablet started to break. When the tablet fractured, the hardness was read with a sliding scale.
Answer: dentist
Explanation:
Dentists are specialize in dentistry, which is a branch of medicine which consist in the study, diagnosis, prevention and treatment of diseases related with the "mouth" or oral cavity. In other words, they diagnoses problems with the teeth and gums.
Answer:
headache and dizziness
Explanation:
Side effects during nitrate therapy are common.
Headache and dizziness are the most common side effect of nitrates.
