What is a significant risk of feeding swill to pigs regarding African swine fever?

Feeding swill to pigs poses a significant risk in relation to African swine fever primarily because the virus responsible for this disease can survive in certain pork products for a considerable time period. When swill includes contaminated pork or meat products, the virus has the potential to infect the pigs consuming this feed, leading to outbreaks of the disease.

African swine fever is highly contagious among pigs and can lead to severe consequences for swine health and the entire industry. The prolonged survival of the virus in meat products means that even small amounts of contaminated food can introduce the virus into a herd, creating a pathway for its transmission and making control measures more challenging.

The other options describe risks or scenarios that don't directly relate to the specific mechanism of African swine fever transmission through swill feeding. For instance, while swill may indeed contain live bacteria, the direct relation to African swine fever is not established as it is for the virus. Pigs developing resistance to other diseases is unrelated to the risks posed specifically by swill feeding. Lastly, although swill could potentially spread diseases through direct contact, it is the viability of the virus in contained products that presents a more significant and established risk regarding African swine fever.