Agent can infect Jt. A variety of infectious agents can travel in the blood and end up in both the brain and a joint however, if a germ known to cause meningitis is only found in the joint it is simply a joint infection.
No. But it's possible for one of the bacteria that causes meningitis to infect a joint. Meningitis is, by definition, an infection of the lining of the brain. When it's in a joint and not in the brain, it's not meningitis. If the infection is in the brain and a joint, then the infected person has meningitis and a joint infection, probably from the same germ.