Question

4. A vaccine used against an infectious disease may contain

a. weakened pathogens
b. specialized blood cells
c. a variety of antibiotics
d. toxic enzymes
Help fast please

Answer 1

Vaccines used against infectious diseases may contain weakened pathogens, which are introduced into the body to elicit an immune response without causing the actual disease.

Step-by-step explanation:

A vaccine used against an infectious disease may contain weakened pathogens. Vaccines work by introducing a material that causes the body to mount an immune response, without causing the disease itself. The material in the vaccine can be weakened forms of a living pathogen, dead pathogens (or inactivated viruses), purified materials such as viral proteins, or genetically engineered pieces of a pathogen. Traditional vaccination strategies use weakened or inactive forms of microorganisms to mount the initial immune response. Live attenuated vaccines and inactivated vaccines contain whole pathogens that are weak, killed, or inactivated. Subunit vaccines, toxoid vaccines, and conjugate vaccines contain acellular components with antigens that stimulate an immune response without presenting the entire pathogen to the immune system.

Answer 2

i believe the answer is A, weakens pathogens. this is because when you get a vaccine the purpose of it is for your body to fight it and build an immunity to the disease, so the vaccine contains weakened strands of the pathogen so that your body can fight it but not kill itself in the process.