Murrein

[A] Church-mans Juriſdiction is no more but to vvatch over his Flock in ſeaſon, and out of ſeaſon, to deal by ſvveet and efficacious Inſtructions, gentle Admonitions, and ſometimes rounder Reproofs; […] againſt a perſiſting ſtubbornes, or the fear of a reprobate ſenſe, a timely ſeparation from the Flock by that interdictive Sentence, leſt his Converſation unprohibited, or unbranded, might breath a peſtilential murrein into the other Sheepe.

Source: wiktionary

[page 47] [B]ecauſe Murreins among the Larger Cattle, and Rots among the Smaller, are the moſt Fatal of Diſeaſes, and ſvveep them avvay by Herds and Flocks, I ſhall (from Long Experience) ſhovv the neareſt vvay to fore-ſee the approaching Danger, […] [page 48] To prevent therefore this Murrein, Long-ſought; or as ſome call it, Gurget: If you are conſtrained to Paſture your Beaſts, bleed them as ſoon as ever the Leaf begins to fall; peg their Ears and Devv-laps vvith Helebore, or Bears-foot, a Plant ſo called; […]

Source: wiktionary