Polio back in Nigeria two years after being wiped out in Africa

Nigeria has faced polios since along time. In 2012, the country accounted for more than half of all cases globally. Immunization is encouraged by the government to eradicate the virus. Nigerian government has a strong collaboration with WHO's polio eradication programme to abolish polios. That huge public health effort has overcome the problem for two years lately. It can be seen by only 21 wild polio cases have been reported so far this year, compared with 34 at the same point in 2015, and WHO has been predicting that the virus will be completely eradicated by 2019.

Unfortunately, in this year, two cases were reported. It was caused by complacent reactions from the government. However the overriding priority has been given to all children around the affected area immediately. The government wants to ensure that all the local children have been immunized.

newscientist.com/article/2100902-polio-back-in-nigeria-two-years-after-being-wiped-out-in-africa/

Try Nigeria has faced a long time problem, Polio.

The government is try to encourage immunization to eradicate the virus.
It also has a strong collaboration....

Nigeria has faced polio since a long time. In 2012, the country was accounting for

had overcome the problem for two years lately. It can be seen by only 21 wild polio cases had been

....However, the overriding priority has been given to the whole children around the affected area

you should put punctuation after However,

Hi, Eka.
I have a few comments of your summary.

Nigeria has faced polio (spelling, polio is uncountable noun, without "s") for long time (difference use of since and for)

... half of all cases globally. Thus,(need conjunction to make it coherent) immunization is encouraged by the ...
Also, the authorities have collaborated (conjunction again and try to use the synonym) with WHO's polio eradication programme to abolish polio .