Which of the following are considered subunit vaccines?SELECT ALL THAT APPLYMessenger RNA (mRNA) vaccinesToxoid vaccinesConjugate vaccinesRecombinant vector vaccinesKilled virus vaccinesLive attenuated vaccines

Subunit vaccines are those that use a piece of the disease-causing organism to stimulate an immune response. They can be made from different components, including proteins or sugars, of the bacteria or virus.

From the list you provided, the following are considered subunit vaccines:

1. Messenger RNA (mRNA) vaccines: These are a new type of subunit vaccines. They work by using mRNA to instruct cells to produce a harmless piece of the target virus, which triggers an immune response.

2. Conjugate vaccines: These are a type of subunit vaccine that connect (or conjugate) parts of the bacteria or virus to proteins that the immune system responds strongly to.

3. Recombinant vector vaccines: These are a type of subunit vaccine that use a harmless virus or bacterium to introduce microbial DNA to cells of the body.

Toxoid vaccines, killed virus vaccines, and live attenuated vaccines are not considered subunit vaccines. Toxoid vaccines are made from a toxin (poison) that has been made harmless but that elicits an immune response against the toxin. Killed virus vaccines are made from viruses that have been killed but are still capable of causing a strong immune response. Live attenuated vaccines use a weakened form of the germ that causes a disease.