Question

For which of the following diseases is no vaccine yet available?

• A. Tetanus
• B. Malaria
• C. Measles
• D. Mumps

Hint:

Think about which of these four is caused by a complex parasite rather than a bacterium or virus.

Answer 1

The Correct Option is B

Step 1: Understanding the Question.
The question asks which of the four listed diseases does not have a vaccine used as part of routine, established immunization.

Step 2: Detailed Explanation of the Diseases with Vaccines.
Tetanus, option (A), is prevented by the tetanus toxoid vaccine, which has long been part of standard childhood and wound care immunization schedules. Measles, option (C), is prevented by the measles vaccine, usually given as the MMR (measles, mumps, rubella) combination shot in early childhood. Mumps, option (D), is also covered by that same MMR combination vaccine, again a well established part of routine immunization.

Step 3: Explanation of Malaria.
Malaria is caused by a Plasmodium parasite spread through the bite of an infected female Anopheles mosquito, not by a bacterium or a simple virus. Because the parasite has a complex life cycle with several different life stages inside the human body and the mosquito, developing a vaccine against it has been far harder than for viral or bacterial diseases. As a result, malaria has not had a routine, widely available vaccine in the way tetanus, measles and mumps have, unlike these three, which are prevented through long standing standard immunization programs.

Step 4: Final Answer.
Among the four diseases, malaria is the one for which no established routine vaccine has been available.
\[ \boxed{\text{Malaria}} \]