(CNN) Reported cases of cholera have risen to more than 1,000 in cyclone-stricken areas of Mozambique, as authorities scramble to contain the spread of the highly contagious, largely waterborne disease.

Almost 1 million doses of oral cholera vaccine were due to arrive in the southeast African country Tuesday, according to the World Health Organization, in anticipation of a mass vaccination campaign throughout the coming days.

Rob Holden, an incident manager with the WHO, told CNN from Mozambique that the teams were ready to begin the campaign as soon as the medical supplies arrives.

"The logistics are in place, and we will start straight away," he said by phone.

"Speed is of the essence, we know how effective the vaccine can be. We are as ready as we can be, will be pushing it out as fast as we can."

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