21.   The bacteria also causes meningitis, a disease of the brain.

22.   The bacteria cause meningitis, a disease of the brain, and meningococcemia, a blood infection.

23.   The bacteria cause both meningitis, a disease of the brain, and meningococcemia, a blood infection.

24.   The class of germs found most often includes ones that can cause meningitis and blood infections.

25.   The Neisseria meningitidis bacteria can cause either meningitis, a disease of the brain, or meningococcemia, the blood infection contracted by the three students.

26.   The same bacteria also cause meningitis, a disease of the brain.

27.   The same bacteria also causes meningitis, a disease of the brain.