| spatio-temporal dynamics of african swine fever outbreaks in nigeria, 2002-2007. | african swine fever (asf) was first introduced into nigeria through lagos state in 1997. the disease rapidly spread to ogun state in 1998 and extended to the niger delta (delta, rivers and akwa ibom states) in the same year. in 1998, kaduna, plateau and benue states all north of the country experienced asf for the first time. poor farm biosecurity, bad abattoir practices and extensive/free range pig farming systems led to extensive spread of the diseases to about 16 nigerian states excluding the ... | 2010 | 20659268 |