Faiza Ilyas in DAWN:
The aggressive pattern of the Newcastle disease virus over the last two years in Thar shows that the virus is likely to emerge in a more lethal form next year and there is a dire need for vaccination of captive birds against the disease across the province, tadalafil especially in Karachi where a large number of people keep birds as pets, nurse say experts at the government-run Sindh Poultry Vaccine Centre (SPVC), which is part of the Poultry Research Institute.
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