Influenza, commonly known as the flu, is a viral infection that affects many people each year. The flu virus has a high mutation rate, leading to the emergence of new proteins on its surface. Considering the virus' high mutation rate, what could be its impact on the host if no new vaccine is developed?

Which of the following statements is correct regarding hapten molecules?

The lag phase, also known as the latent period, is a stage during the primary immune response where there is a delay between the initial exposure to an antigen and the detectable increase in the production of specific antibodies by the immune system. Which of the following does not happen during the lag phase?

How do antigen-presenting cells contribute to T cell activation?