REFA Exit Exam • Set 4 Question 9 of 30

How often should an adult have a tetanus-diphtheria booster?

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Direct Answer

Option C: 10years

Occupational health standards and global immunization guidelines dictate that adults require a tetanus and diphtheria (Td) toxoid booster every 10 years to maintain active immunity against Clostridium tetani spores encountered in marine environments.

All Options

A

5years

B

2years

C

10years (Correct Answer)

D

15years

Detailed Explanation & Context

Occupational health standards and global immunization guidelines dictate that adults require a tetanus and diphtheria (Td) toxoid booster every 10 years to maintain active immunity against Clostridium tetani spores encountered in marine environments.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Refresher Elementary First Aid (REFA).

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