It's perhaps worth looking at some known incidences of
smuggling of poultry and other birds
as surely potential for transporting H5N1 poultry flu - indeed, H5N1 has been detected in birds smuggled to Taiwan; and only known incidences so far of H5N1 in western Europe have been in smuggled birds.
"duck meat smuggled from eastern China and intercepted in Taiwan in 2003." contained H5N1
"In midnight of October 14, 2005, Taiwan Coast Guard Administration confiscated 1,037 birds from a freighter of which the ship staff smuggled the birds from China into Taichung. ... test results confirmed that those smuggled birds were infected with highly pathogenic avian influenza (HPAI) H5N1 virus."
Thai eagles smuggled into Belgium were infected with H5N1
Pathogenic H5N1 Influenza Virus in Smuggled Thai Eagles, Belgium
"The only incidence of H5N1 in the UK, so far during this outbreak, was linked to trade in caged birds (the infamous parrot)."
"Chinese-raised poultry, banned in the United States out of fear of spreading diseases, is nonetheless reaching markets and restaurants in the United States after escaping detection at borders.
Outbreaks of bird flu in Asia have led the government to step up its anti-smuggling operations. In a two-month period this fall, 165,000 pounds of Asian poultry was seized, according to figures compiled in the Department of Agriculture."
There's poultry smuggling from China to Hong Kong, for instance: "Customs officers seized $450,000 worth of smuggled chilled poultry from a river trade vessel from Zhuhai during an anti-smuggling operation yesterday (March 22). While patrolling in the waters off Shek Kwu Chau at about 4pm, a Customs launch intercepted and searched a vessel declared to be containing potatoes. As a result, Customs officers found a large quantity of chilled poultry, including 1,158 cartons of geese, 688 cartons of ducks, 465 cartons of chicken, and 17 cartons of pigeons."
In Laos: "The officials must monitor poultry sales at markets to prevent traders from selling poultry smuggled in from neighbouring countries in a bid to prevent the entry of bird flu into the country."
also (maybe not smuggling): "an outbreak of H5N1 among poultry in Lhasa, Tibet, in January 2004 was traced to a shipment of chickens from Lanzhou in China’s Gansu Province, about 1500 kilometers away. "