(CNN) The Ebola virus has reached the Congolese city of Goma, a major transit hub that is home to more than 1 million people on the Rwandan border.

The case, which was confirmed Sunday by the country's Ministry of Health , has raised fears that the virus could make its way across the porous border into still-uninfected Rwanda -- something health experts have been working desperately to prevent.

The ministry announced Sunday that a sick pastor had arrived in the regional center by bus from the northeastern city of Butembo, where the virus first struck last September.

Authorities said they had tracked down all the passengers on the bus and the driver.

As a result of the speed in which the patient was quickly isolated and transferred to an Ebola treatment center, the risk of the disease spreading in Goma was low, the ministry said. The bus driver and the 18 other passengers will be vaccinated on Monday.

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