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A healthy immune system means that our bodies have a stronger chance of fighting off viruses and infections. While viruses such as the Coronavirus will not be able to be stopped merely by healthy immune systems, we can see that weaker immune systems have a part to play in that the people who are most affected like the elderly and those with underlying or existing medical conditions. Their immune systems are generally weaker because of their condition or age and are not as effective at fighting off a virus or infection.