Medieval European fishermen first took to the open seas in about AD1.000 as a result of a sharp decline in large freshwater fish, scientists have suggested. They say the decline was probably the result of rising population and pollution levels.

The director-general of the World Health Organization, Margaret Chan, closed Friday the agency's annual conference with a warning that nations, particularly in the Southern Hemisphere with the winter season on, must remain vigilant and be prepared for a possible swine influenza A-H1N1 virus pandemic.

World Health Organization (WHO) Director-General Dr Margaret Chan and United Nations Secretary-General Ban Ki-moon met on Tuesday with over 30 vaccine manufacturers from developing and developed countries at WHO headquarters in Geneva.

A sixth person has died of the mosquito transmitted dengue disease in Argentina. The Bolivian born victim died in the northern province of Salta of “dengue-shock syndrome”, which is a consequence of the more lethal form of the disease haemorrhagic dengue, reported the local daily “El Tribuno”.

The spread of swine flu and possible vaccine production dominate the agenda of the World Health Organization assembly which begins Monday in Geneva until May 22.

The Argentine government announced on Thursday it would lift a ban on direct flights from Mexico imposed over two weeks ago due to an outbreak of the new H1N1 flu in that country.

Chileans consumed 81.3 kilos of meat per capita in 2008, 26% more meat than they did 10 years ago, according to a study recently published by the country’s Office of Studies and Agrarian Policy (ODEPA) of the Ministry of Agriculture.

Argentine sanitary officials confirmed Monday five new cases of autochthonous dengue in the capital Buenos Aires and another in the province of Buenos Aires while the official figures from the federal ministry of Public Health indicate that there are 23.470 confirmed infections from the mosquito transmitted disease.

Moves to make a peace deal between pro and anti-whaling nations have stalled, with no chance of agreement. Countries have been talking for nearly a year in an attempt to hammer out an accord by this year's International Whaling Commission (IWC) meeting. But a draft report seen by BBC News admits the process has fallen short.

At the end of last week, the World Health Organization said it had no immediate plans to raise the pandemic alert to level 6 from 5, though the agency continues to closely monitor the spread of the virus.