1.   Gill said inoculating animals was an imperfect solution that could be used to buy time while officials slaughter livestock in hopes of stopping the disease.

2.   Officials slaughtered infected livestock, burned barns and banned imports of Chinese hay suspected of having transmitted the disease.

3.   South Korean officials have been slaughtering infected animals, quarantining farms and forbidding them to transport livestock.

4.   To contain the virus, health officials slaughtered more than a million chickens in Hong Kong and blocked importation of chickens from nearby provinces in China.