 [ Symptoms ] i fell pregnant found out it was a chemical pregnancy now having non stop hot flashes [ Disease ] adults do have better immune systems and exposure to any infectious disease does not automatic imply that you or a sibling contact will get it but you may there are just too many variables to be able to predict if someone will also become ill your twin six month olds are more vulnerable of course since they are at the end of their maternal immunity stage only time will tell for all of you