TRENTON, N.J. (AP) — Drugmaker Pfizer Inc. is continuing its shopping spree with its fourth acquisition since the April collapse of its planned $160 billion megadeal to buy rival Allergan PLC and move its headquarters, on paper, to Allergan's base in lower-tax Ireland. In its second deal this week, New York-based Pfizer said it's buying rights to Anglo-Swedish drugmaker AstraZeneca PLC's portfolio of approved and experimental antibiotic and antifungal pills, a move to boost Pfizer's business in one of its priority areas.