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Pathogenic mechanism of porcine viral disease
Swine virus diseases pose a significant threat to the pig industry due to their highly contagious nature and ability to cause immense harm. Once a pig is infected, the risk extends to the entire farm or even a larger area. In recent years, there has been an emergence and re-emergence of disease pathogens that have been able to overcome existing immune defense mechanisms through continuous recombination and evolution. As a result, current immune prevention and control measures have become ineffective. Notable examples of these diseases include African swine fever virus (ASFV), porcine reproductive and respiratory syndrome virus (PRRSV), porcine epidemic diarrhea virus (PEDV), and porcine pseu...
Fire Underground
How a modern-day mine disaster has turned a Pennsylvania community into a ghost town * For much of its history, Centralia, Pennsylvania, had a population of around 2,000. By 1981, this had dwindled to just over 1,000—not unusual for a onetime mining town. But as of 2007, Centralia had the unwelcome distinction of being the state’s tiniest municipality, with a population of nine. The reason: an underground fire that began in 1962 has decimated the town with smoke and toxic gases, and has since made history. Fire Underground is the completely updated classic account of the fire that has been raging under Centralia for decades. David DeKok tells the story of how the fire actually began and how government officials failed to take effective action. By 1981 the fire was spewing deadly gases into homes. A twelve-year-old boy dropped into a steaming hole as a congressman toured nearby. DeKok describes how the people of Centralia banded together to finally win relocation funds—and he reveals what has happened to the few remaining residents as the fiftieth anniversary of the fire’s beginning nears.
