Two members of a Self-Defense Forces unit stationed in Djibouti in eastern Africa have been infected with the coronavirus, the Defense Ministry said Sunday, bringing the total to four.

The latest infections were confirmed at a base where around 110 troops are working in support of Japan's anti-piracy mission in waters off neighboring Somalia.

The ministry said the series of infections has not disrupted the mission, which involves Maritime Self-Defense Force vessels and patrol aircraft operating in the Gulf of Aden.

The two MSDF members, whose ages are between 20 and 40, tested positive for the virus on Saturday at the base's medical office. Both are in a stable condition while two of their colleagues who were in contact with the infected pair have been isolated, the ministry said.

The announcement came a day after the ministry said two Ground Self-Defense Force members stationed at the base were infected with the virus.