Inglês — L. interpretação de texto - reading comprehension

READ TEXT III AND ANSWER QUESTIONS 18 TO 20: TEXT III Bird flus huge potential risk By Alex Kirb BBC News Online environment correspondent Bird flu could develop into a threat big enough to overturn world order if it evolves to transfer directly from person to person, a UK scientist says. Dr John McCauley, of the Institute for Animal Health, said the virus could be 20 times worse than the 1918 pandemic. That is estimated to have killed 40 million people, with later influenza outbreaks also killing millions more. Dr McCauley said there was a realistic chance of the current avian flu virus evolving to threaten people directly. Dr McCauley, whose research into avian influenza is being funded by the Biotechnology and Biological Sciences Research Council (BBSRC), was speaking to BBC News Online. He said: At the moment the virus affects humans only after transferring to them from poultry. In 1997, six people died in Hong Kong after 18 became infected. This year, 23 patients have died from a total of about 34 people infected in south-east Asia. That means there is a mortality rate from some strains of highly pathogenic avian influenza of between 30 and 60% of those infected. In 1918, the rate was about 1%. Theres no reason to say the virus will not continue to evolve so that it can transmit directly from one person to another. Theres a realistic chance that could happen. If it does - if the virus becomes adapted to man and can transmit efficiently - therell be no point in selling a vaccine. You might as well give it away at that stage, because money would be meaningless. The world order would change. (http://news.bbc.co.uk/go/pr/fr/-/1/hi/sci/tech/3643643.stm,21/04/04)

those in 30 and 60% of those infected (ll. 21-22) refers to: