1.   Doctors still do not fully understand the process by which the disease is transmitted.

2.   However, semen can transmit certain diseases.

3.   ...mosquitoes that transmit disease to humans.

4.   The disease is transmitted by sexual contact.

5.   The disease is easily transmitted from person to person.

6.   Although a handful of drugs still work against resistant strains, the failure of initial treatment allows infected individuals to continue transmitting the disease to their sexual partners.

7.   An HIV-infected person is much less likely to transmit the disease if the drugs have kept the virus in check.

8.   And the city was already eradicating the mosquitoes that transmitted the disease, whatever it was.

9.   As there is no current evidence that the disease is transmitted by blood, none of the patients were told about the diagnosis.

10.   At the club, three men had been infected, then had transmitted the disease to at least eight more men.