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Table 2 Definition of site immune status according to the PRRS control program and model assumptions for underlying immunity

From: Development of a stochastic agent-based model to evaluate surveillance strategies for detection of emergent porcine reproductive and respiratory syndrome strains

    

Breeding sites

Growing pig sites

Immunity levela

OSHAB classification

Serologyb

Virus detectionc

Comments

Comments

Completely susceptible

Confirmed negative

Negative

Negative

Series testing

Series testing

Partially susceptible

Confirmed positive

At least one positive

Parallel testing

Parallel testing

Completely susceptible

Presumed negative

-

-

Sample size not met, sample of downstream growing pig sites

Sample size not met, sample of upstream sow sites

Partially Susceptible

Presumed positive

-

-

Downstream sites confirmed positive by diagnostic test, veterinarian assessment of site

Upstream sites confirmed positive by diagnostic test, veterinarian assessment of site

  1. aAs defined by the current model (underlying swine site immunity)
  2. bEvidence of previous exposure to porcine reproductive and respiratory syndrome virus (PRRSV), measured through ELISA testing for antibody detection in serum or oral fluids
  3. cEvidence of current virus infection, measured via PCR testing in serum, oral fluids or tissue samples