Грипп птиц: угроза пандемии и меры предосторожности в Сингапуре

Singapore has taken a series of measures against avian influenza and the potential threat of a pandemic.

As of 17 October 2005, there were no cases of H5N1 avian influenza detected in Singapore, either in humans or poultry.

A major avian influenza pandemic will be very costly in terms of human lives as well as economic losses, especially in the densely populated city state of Singapore. Bird flu has infected poultry in large parts of Asia since 2003, killing at least 65 people, mostly in Vietnam and Thailand. Millions of birds have been culled to stop the spread of the disease. In October 2005, strain of the bird flu virus was detected in Turkey and Romania indicating that the avian flu was spreading from Asia to Europe. Most of the human deaths so far have been linked to contact with sick birds. But the World Health Organization has said that the virus could mutate into a form that is more easily transmitted from human to human and possibly triggering a pandemic reminiscent of the 1918 flu epidemic that killed tens of millions worldwide. In Thailand, a probable case of human to human transmission of H5N1 virus was reported in the northern province of Kamphaeng Phet. This is consistent with current knowledge of the behaviour of H5N1 virus that inefficient, limited human to human transmission may occur on rare occasions. As of 17 October 2005, evidence indicated that spread among humans has been limited to this cases, nonetheless, surveillance has been intensified in the province.

When planning the response, it is assumed that the first local human case is likely to be imported from affected countries and is difficult to prevent. The virus, which is more infectious than SARS, is likely to spread quickly and has a high morbidity and mortality. There will not be any vaccine initially, and the vaccine development will take at least 4 to 6 months. Even when developed, initial supply of the vaccine will be limited.

Surveillance for influenza involves monitoring for virus strains and disease activity. A nationwide reporting scheme for acute respiratory infections has been established. The National Influenza Centre routinely carried out virological testing of respiratory samples from hospitals and polyclinics. The Agri Food and Veterinary Authority of Singapore (AVA) also carries out routine surveillance on poultry. The Jurong Bird Park has put 19 chickens, bred without any immunity, in all its aviaries to help detect the presence of any infectious disease.

In June 2005, a ban was imposed on keeping live poultry in Pulau Ubin, this is to prevent infection on the livestock by migratory birds.

To tackle a possible outbreak of bird flu, Singapore is increasing its resource such as isolation facilities in hospitals and stockpiling medicine. These medicines include Tamiflu and Relenza. As of November 2005, the country has supplies to treat 430,000 people. By sometime in 2006, there will be enough stockpile anti viral medication for one quarter of the population. A priority plan has been outlined as to who will get these anti viral drugs first when a bird flu pandemic breaks out and the first people to receive the drugs would be health workers, and those involved in essential services like power and public order.

In the event of an outbreak, Singapore will resume health screening of all visitors, as during the 2003 SARS crisis and quarantine suspected victims. Travel restrictions or advisories would be issued to restrict travel to and from countries which had outbreaks of bird flu. All persons presenting with the abrupt onset of signs and symptoms will be treated with anti virals. Front line healthcare workers in hospitals and polyclinics will also be given anti viral prophylaxis for the duration of the pandemic.

In January 2006, Singapore announced that it will contribute S$1 million over three years to the global fund raising effort to fight bird flu, specifically for ASEAN countries.

Haugan, Salomon Avian Influenza: Etiology, Pathogenesis and Interventions (Public Health in the 21st Century. Nova Science Pub Inc. 30 January 2010)