If you are asking if this makes the potential infection more dangerous, the answer is no. The virus remains the same.
Some people are just at much higher risk for complications than others.
Everyone who may have been exposed should self-quarantine for the recommended two weeks, and watch carefully for any fever, cough or other symptoms that may indicate an active infection. At this time, it is recommended that you call your doctor or go to an Emergency room for testing.
Always, always speak to your doctor before taking medical or health-related actions, and in any case of emergency contact the appropriate medical assistance services.
In the United States, you can call your local physician, consult the CDC via website (cdc.gov) or general information helpdesk at 1-800-CDC-INFO. In case of emergency, dial 9-1-1.
In the UK, consult the NHS website or dial 111 for urgent medical issues.
For Coronavirus/COVID-19, the World Health Organization has assembled a page providing more in-depth information and guidance HERE.