Figure 1.

Anti-viral approaches may (1) prevent viruses acting in a synergistic or additive manner with allergens, and cause immune deviation to a Th1 rather than Th2 immune response. Anti-viral approaches may be (2) agents that prevent virus infection or replication at mucosal surfaces and prevent epithelial damage, inflammation, mucous production, activation of macrophages and attraction of neutrophils into the lung, which promote further inflammation and damage.