Neither of these things are guaranteed to happen if you get the flu vaccine when you are sick, but they are possibilities. If you have just a mild illness, there is no reason to wait to get vaccinated.
Early in the day, let roast stand at room temperature at least 1 hour before cooking. Preheat oven to 375 degrees. Rub meat ... the outside and rare in the middle. Meat will be very brown ... stand at room temperature for at least one hour.
Use a thermometer to read the internal temperature of the roast. When the temperature reaches 140 degrees F (60 C), pull the roast out of the oven; itâll continue to cook due to the residual heat and will reach 145 degrees F (63 C).