Chicken pox doesn't "mean" anything. Chicken pox is simply a virus that most people contract at some point during their lives that causes a skin rash. After getting the virus, your body builds immunity to it, so in most cases, it is not contracted again. Having chicken pox now or in the past is not an indicator of health.
It means you're immune to chickenpox.
To "rule out" something means to eliminate it as a possibility. Therefore, if the doctor has ruled out chickenpox, it means she has decided that you don't have chickenpox.
Any outbreak of chickenpox creates immunity in a healthy person. A severe outbreak doesn't make a person more immune than a mild outbreak.
Typically it is not dangerous for a baby to get chickenpox if the baby is otherwise healthy. Incidentally, babies under the age of 12 months who get chickenpox are more likely to get shingles later in life. Talk to your health care provider for information specific to your situation.
In the US, you may be eligible for unpaid Family and Medical Leave Act time off to care for a child with chickenpox. Ask your human resources department if FMLA applies to your employer.
The chances of developing encephalitis as a complication of chickenpox (varicella) are relatively low. Encephalitis occurs in approximately 1 in 4,000 cases of chickenpox. While the risk is higher in certain populations, such as immunocompromised individuals, most healthy children recover from chickenpox without severe complications. Vaccination against chickenpox significantly reduces the incidence of both the disease and its associated complications.
Mild means not very severe or serious.
Chickenpox is a contagious disease caused by varicella-zoster virus. It leads to a skin rash that is itchy and after a few days transforms into blisters. Chickenpox virus is transmitted by air and reaches a healthy organism by mouth or by nose. If an infected person coughs or sneezes and the small particles of saliva reaches a healthy person the virus will get into the lungs and then into the blood stream. If a person has had chickenpox the chances for it to develop this disease again are quite small. Chickenpox is very contagious and generally 90% of those who live close to the infected person will catch the virus if they are not immunized against it. It seems that chickenpox occurs more often during later winter and early spring moths.
Mild means not very severe or serious.
There is no chickenpox RNA; chickenpox is a DNA virus.
A person with a history of chickenpox or history of chickenpox vaccine will typically have a positive antibody test for chickenpox.
The death rate for chickenpox is quite low, typically estimated at about 1 in 60,000 to 1 in 100,000 cases in healthy children. However, the risk of severe complications and death increases in certain populations, such as infants, immunocompromised individuals, and adults. Vaccination has significantly reduced both the incidence of chickenpox and its associated mortality.