Dairy 5 Ultimate Study Guide

Epidemiological Triad Framework

A model that explains disease occurrence as a result of the interaction between host, agent, and environment.

Agent

Pathogens such as viruses, bacteria, or parasites defined by their strain characteristics, infectious dose, and virulence.

Host

The living organism that provides a suitable environment for a pathogen, affected by factors such as immunity and nutritional condition.

Environment

The external conditions affecting the host and pathogen, including housing, sanitation, and management practices.

Elimination/Eradication

Complete removal of a pathogen from a specific population or geographic region.

Exclusion

Biosecurity measures designed to prevent new infections from entering a clean herd or area.

Inter-Herd Biosecurity

Policies aimed at controlling animal movement and ensuring cleanliness during interactions between herds.

Intra-Herd Biosecurity

Protocols to minimize pathogen transmission between management groups within the same herd.

Bovine Viral Diarrhea Virus (BVDV)

An economically significant pathogen affecting cattle, associated with various clinical diseases.

Cytopathic (CP) Strains

A category of BVDV that causes visible cell destruction in cultures and can lead to fatal mucosal disease.

Non-Cytopathic (NCP) Strains

BVDV strains that do not cause cell lysis and can lead to the birth of persistently infected calves.

Persistently Infected (PI) Animals

Cattle that are infected with BVDV in utero and continuously shed the virus throughout their lives.

Mucosal Disease

A severe form of BVDV disease that occurs in PI animals superinfected with a CP strain.

Johne's Disease (Paratuberculosis)

A chronic disease in ruminants caused by Mycobacterium avium subsp. paratuberculosis, leading to severe gastrointestinal issues.

Transmission Kinetics

The various mechanisms of pathogen spread between hosts, including fecal-oral routes.

Critical Control Points (CCPs)

Key points within a farming system where biosecurity and management practices can prevent disease spread.

Zoonotic Pathogens

Pathogens that can be transmitted from animals to humans, posing significant public health risks.

Biosecurity

Practices aimed at preventing the introduction and spread of infectious diseases in livestock.

Vaccine Efficacy

The effectiveness of a vaccine in providing protection against disease.

Environmental Hygiene

Management practices aimed at maintaining cleanliness in animal housing and production areas.

Colostrum Management

Strategies to ensure newborns receive high-quality colostrum to boost immunity and prevent infections.

Viremia Kinetics

The dynamics of virus presence in the bloodstream during an infection.

Serologic Testing

Use of blood tests to detect antibodies against specific pathogens to assess exposure and immunity levels.

Fecal Culture

Laboratory technique used to isolate specific bacteria from feces to diagnose infections.

Direct Fecal PCR

Method that identifies pathogens in feces using molecular techniques, allowing quick and sensitive detection.

Risks Assessment and Management Plan (RAMP)

A tool used to evaluate biosecurity practices and identify areas for improvement in herd management.