Next story today, good news and bad news concerning the flu. The good news, the Centers for Diseases Control says flu activity across the U.S. is pretty low.The bad news, this year's vaccine isn't particularly effective. The CDC says it's because the flu has mutated.When the vaccine was made, the strains of flu circulating around the globe were different than they are now. So, why not just make a new vaccine?Well, the CDC says it's too late, because that takes about four months to do.Officials are still recommending the vaccine, though. They say it can reduce the severity of the virus, if you get it.Amsterdam is the largest city in and capital of Netherlands.It's second largest city Rotterdam, and that's where we found the Rotterdam international secondary school for Today's Roll Call.In the states, in Indianapolis, in Indiana, the rockets of Broad Ripple Magnet High School are in today's show.And in the Southeast, in Mableton,Georgia Floyd Middle School is on the roll. We are happy to visit the Panthers today.Opossums, also called possums, are the only marsupials found in the U.S.And though they might hiss or bite if you mess with them, they are usually not aggressive and they are unlikely to carry rabies.Why? Well, even though they are mammals, they have relatively low body temperatures, and that might make it hard for the rabies virus to survive in opossum. Now, that's random.
接下来我们关注流感。好消息是美国疾病控制中心表示全美的流感活动相当低。而坏消息则是今年的疫苗并非特别有效。疾控中心称这是因为流感变异所致。当疫苗完成的时候,全球流感的流行菌株和现在相比已经截然不同。那为什么不制造新疫苗呢?疾控中心称那样做为时已晚，因为制造新疫苗需要大约4个月时间。不过官员仍然推荐当前的疫苗。他们称接种疫苗可以减缓病毒的侵袭程度。阿姆斯特丹是荷兰最大的城市,同时也是这个国家的首都。而第二大城市则是鹿特丹。鹿特丹国际中学荣登我们今天的点名节目环节。印第安纳州的印第安纳波利斯,布罗德里皮尔高中同样进入今天的点名环节。还有东南部玛布尔顿,乔治亚州弗洛伊德中学。我们很高兴去看看那里的美洲豹。负鼠,也被称为袋貂,是在美国发现的唯一有袋动物,虽然你惹恼它们后可能会发出嘶嘶声或咬你,但这种动物通常不具有攻击性,而且不太可能携带狂犬病。为什么?嗯,即使作为哺乳动物,它们的体温也相对较低,这就使得狂犬病毒在负鼠体内很难生存。现在这只是偶然所致。
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