The inoculations, using an experimental vaccine, began on Wednesday and are part of a wider Ebola prevention plan in a country that has faced multiple Ebola outbreaks since 2000.
After entering the body, it kills cells, making some of them explode, it wrecks the immune system, causes heavy bleeding inside the body, and damages nearly every organ, though it is scary, but it's also rare.
Earlier this month, the health ministry said it will install health checkpoints at the entrances to all polling stations in Congo's Ebola-affected region during the December presidential election, when millions of Congolese are expected to come out to vote.
No fewer than 3,000 health care and frontline workers in the five high-risk western districts bordering the eastern Democratic Republic of Congo are targeted.
Uganda is the first country in the world to give the vaccine without an active outbreak of the disease, but is judged to be at very high risk. Since 2014, about 2,000 people have been killed in clashes between armed groups.
Investigators believe that the first victim of Ebola in any outbreak acquires the virus after coming into contact with a "reservoir" animal, say an infected bat or monkey.
With high fatality rates ranging from 50 per cent to 89 per cent, the highly contagious Ebola virus could cause a range of symptoms including fever, vomiting, diarrhoea, generalised pain or malaise and in many cases internal and external bleeding.