The virus can also be transmitted from mother to child.
The virus cannot be transmitted from one person to another, the officials said.
"A lot of people don't know how the virus is transmitted."
The virus is still being transmitted in some Southern states.
The risk of the virus being transmitted to other European countries is also high.
This virus has been transmitted at least three times into Japan between 260-430 years ago.
This led to greater opportunity to transmit the virus to more people.
Also, the risk of transmitting the virus to the baby is considered very low.
For the first 10 to 12 days the person feels well and cannot transmit the virus.
Dogs are not known to transmit the virus to people.