I have been thinking this over and wonder how many have had the Rhogam shots? I remember these shots like it was yesterday when I got them. Within a half hour of getting the shot I thought I was going to freeze to death. The first shot I actually got was in Mass. in August. I have 5 children. I have A- blood and my youngest and oldest are negative but the 3 in the middle are positive. I received the Rhogam shots in 1976, 1979 and 1980 after they were born. I wonder if there is some connection.