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Proportions of clinically healthy pigs positive for Streptococcus suis in tonsil biopsy (TB) and tonsil swab (TS) samples by culture (c) and multiplex polymerase chain reaction (PCR) assay. Sows 1–2 — 1st- and 2nd-parity sows (n = 40); Sows 3–4 — 3rd- and 4th-parity sows (n = 40); Sows 5+ — sows with 5 or more parities (n = 40); PW — pigs in the postweaning section (n = 120); F1 — fattening pigs aged 14 to 16 wk (n = 120); F2 — fattening pigs aged 20 to 22 wk (n = 120).
