While Swine Fever shows normal flu symproms, there have been usualy symproms including diarrhoea and vomiting. Many recent travelers to affected countries tend to attribute symptoms to profound jetlag, and this had led airport authorities in several countries to quarantine inbound travelers who show a raised body temperature.
THE VIRUS ITSELF
The virus responsible for the Swine Fever outbreak is a flu virus that primarily infects pigs, and when it spreads to humans, which is rare, it is via an infected pig. The bad news is that these viruses, like most influenza causing viruses, mutate quickly. The original outbreak was caused by a H1N1 strain of influenza type A virus, and having modified its surface structure and DNA makeup, it has now incorporated genetic material from virus strains that can cause illness in humans, birds as well as swine. This kind of inter-special crossinfecting traits help the virus to spread across species thereby wideing its exposure range.
Although there is no vaccine currently, several agencies have been contracted to develop one. There have been reports that recommend using facemasks, though no corroboration that this is effective has been offered my any of the Health Ministries. It is evident that facemasks do not offer adequate protection.
The best approach is to limit travelling to areas that have established cases of Swine Fever. Or at the very least keep tabs on symptoms if one is returning from these countries.