Egypt has begun a mass slaughter of thousands of pigs in an effort to prevent swine flu spreading.
The cull was going ahead despite there being no cases of swine flu in Egypt. However, neighbouring Israel has two confirmed cases in humans.
"It is decided to slaughter all swine herds present in Egypt, starting from today," said Health Minister Hatem el-Gabali, according to Mena news agency.
Swine flu has spread from Mexico to several countries around the world.
From Muslim Qandeel, BBC Arabic
Zaraib, or Stables, is a shanty hidden away in Western Cairo. I had to gain access by jumping over a wall as police have blocked off the area.
Here they breed pigs that feed on refuse. Thousands of Christians live here - and there is one Muslim breeder too, despite the ban on pork in Islam. People are anxious about the cull, fearing it will destroy their livelihood and the government will not give compensation.
"We have been living here for years doing this. We will not surrender," one breeder said. They are threatening a strike. "Let Cairo drown in garbage."
The pigs in Egypt, a largely Muslim country, are raised by the Coptic Christian community.
Estimates of the number of pigs range from 250,000 to 400,000.
Up to 169 people are believed to have died in the outbreak - all but one of them in Mexico.
Confirmed cases of swine flu have been reported in numerous other countries, including New Zealand, Spain, Austria and Canada, but most have been mild cases.
Many of those victims had been to Mexico, prompting airport screening for passengers displaying potential flu symptoms.
Egyptian authorities increased numbers of medical staff at Cairo airport to check passengers arriving from Mexico and will monitor them during their stay.
Egypt suffered during the outbreak of bird flu, between 2004 and 2008, with 22 deaths reported.
The latest swine flu is a variation of H1N1, which causes seasonal outbreaks of flu in humans on a regular basis.
However, this strain contains genetic material that is typically found in strains of the virus that affect humans, birds and swine.
Pigs can act as a "melting pot" for several flu strains.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.