Natural or induced immunity is achieved by the production of specific opsonic antibodies against F1 and V antigens; antibodies against F1 and V induce phagocytosis by neutrophils.
A inmunidade natural ou inducida conséguese pola produción de anticorpos opsonizantes específicos contra os antíxenos F1 e V; os anticorpos contra F1 e V inducen a fagocitose por parte dos neutrófilos.