They have already had it and carrier of it with asymptotic and never knew or if they catch after rains peoples systems are low. In immune systems that is the natural fighter that cross the blood and brain. Barrier if low they can be prone to catching it as well. 
But the answers provided im not seeing the real answer as in they put the problem that caused a. Disease in a vaccine only so much of it and add antidote example flu shot . It attacks some people immune system and they get sick because of injecting it into them but the belief is of catching it after I don’t believe I believe either your body can handle it or it does not and rejects it in the blood brain barrier so if recieved then you will get sick after getting the immunization
 
        
             
        
        
        
In a chemical reaction, the atoms and molecules that interact with each other are called reactants. ... No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
 
        
             
        
        
        
All of the above! A healthy soil ecosystem needs fungi, bacteria, and nematodes in order to properly function, especially in the aspects concerning decomposition!<span />
        
                    
             
        
        
        
Answer: The function of the coded instructions contained in the body cells of an organism is called the Genes
Explanation:
 
        
             
        
        
        
Answer:
Change of temperature
Explanation:
The independent variable is what you change and the dependent variable is what changes because of what you change.
If you have 2 cookies you will have only 1-2 people if you have 200 cookies you would have more people. The independent would be how many cookies you have and the dependent variable would be how many people come.