Background: Two major porcine circovirus type 2 (PCV2) genotypes, PCV2a and PCV2b, are recognized.PCV2a was predominant in the global pig population until 2000 while PCV2b became predominant from 2003
INTRODUCTION AND OBJECTIVES After binding by acetylcholine released from a motor neuron, a nicotinic acetylcholine receptor at the neuromuscular junction produces a localized end-plate potential, whic