Comparison of Avian Influenza Virus Contamination in the Environment Before and After Massive Poultry H5/H7 Vaccination in Zhejiang Province, China.

In contrast to H7, the positive rate of H5 subtype was low since September 2017 and showed an increasing trend after October 2018 ( Figure 1 ).

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Most cities showed increasing contamination by H7 subtype from periods 1 to 3, which remained stable during periods 4 to 5 and from period 6, began displaying a decreasing trend in all cities, and no positive sample was detected during periods 6 or 7 in half of the cities ( Figure 2C ).

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