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As governments and health officials navigate pandemic, researchers stress the danger that comes with bad information.

Since researchers were working with samples in a lab. cnn's larry madowo is live in johannesburg. that's where they are getting a sense of how effective the vaccines are against it. >> reporter: that's correct, max. this is the first experiment that tries to track how this omicron variant might behave in somebody who is already vaccinated. so it's a small sample size, just 12 samples here in a lab. so it's not a real-life experiment. but the researchers say this is a little positive because they expect it to be way worse. the headline here is that at least for the pfizer virus, the omicron v...

10 out of 10 times. now, obviously, that's a relatively small sample size but whenever you get 10 out of 10 in politics, that's a very clear sign the democrats at this point, if history holds, are in a lot, a lot of trouble. >> harry, one of the things congress watchers do, it's like detecting trouble in a forest. you see rabbits and squirrels and animals running out of the woods into the field and democratic congressman peter defazio from oregon, he just announced he's retiring. this is the 11th house democrat to retire from public office to announce it ahead of the midterms. this is signific...

Another, but potentially also invade the immune system >> and many mutations in omicron are similar to the highly contagious mutations in delta do we know if it is more transmissible than the delta variant? >> if you look at the data out of south africa, it does appear it is more transmissible than delta. i think again, it is sort of a small sample size. >> that sample size is only around 100 confirmed cases of omicron in south africa but officials describe an exponential rise in overall covid cases and blame the new variant with many likely not yet confirmed. as to whether it is more dangerou...

Refer to united states residents. united, the only other major airline to operate from the region, the airport group says it has many unanswered questions about the new measures. and sweeping travel restrictions are going in effect in israel. an expert says that israel is now on the state of emergency as confirming its first omicron variant case. hamas gold reports. >> reporter: the government acting quickly. the person returned from malawi, the variant detected because earn person to tel aviv must get a pcr test before they can leave the airport. health officials say people with suspected cas...