Each month the visa bulletin which is published by the US State Department has a section for the selected winners of the American diversity visa lottery program. Here they can find out which case numbers are going to be current in the coming months. If you are a DV lottery winner and your case number becomes current in these months, then you can expect the second letter (visa interview letter) to come with the time and the date of the interview date to your given address by normal post. The second letter used to come 4 - 6 weeks before the interview date. In the bulletin you can find all the six regions and case numbers along with the case numbers which are going to be current. In the Africa region some countries may listed separately with the case numbers which are going to be current. Normally Egypt, Ethiopia and Nigeria are listed separately with their own case numbers.