Letter V

Vaccination: The administration of vaccines (mainly in fish, via injection or immersion) to induce immunity against specific diseases (e.g., Streptococcus).

Vector: An organism (e.g., a bird, a crab, personnel) that can transmit a pathogen from one host to another without necessarily being sick itself.

Vibrio: A genus of bacteria common in aquatic environments. Many species are pathogenic to shrimp (e.g., causing AHPND, Vibriosis).

Virus: A sub-microscopic infectious agent that replicates only inside the living cells of an organism (e.g., WSSV, IMNV).

Vitamin (C, E): Essential micronutrients. Vitamin C, for example, is crucial for stress response and wound healing.