WASHINGTON - The new H1N1 influenza virus bears a disturbing resemblance to the virus strain that caused the 1918 flu pandemic, with a greater ability to infect the lungs than common seasonal flu viruses, researchers reported on Monday.
Tests in several animals confirmed other studies that have shown the new swine flu strain can spread beyond the upper respiratory tract to go deep into the lungs — making it more likely to cause pneumonia, the international team said.
In addition, they found that
people who survived the 1918 pandemic seem to have extra immune protection against the virus, again confirming the work of other researchers.
"When we conducted the experiments in ferrets and monkeys, the seasonal virus did not replicate in the lungs," said Yoshihiro Kawaoka of the University of Wisconsin, who led the study.
The H1N1 virus replicates significantly better in the lungs."
Separately, a top official at the World Health Organization said Monday a fully licensed swine flu vaccine might not be available until the end of the year
[too late]. The report could affect many countries' vaccination plans
[surprise, surprise: trust the health authorities and "experts" - not].