, although the actual number of people affected may be higher . New data released by the CDC Tuesday showed that the majority of the 30 patients who were hospitalized with H1N1 in California had other medical conditions , such as chronic heart and lung disease , suppressed immune system , diabetes , and obesity . None of the patients died . They had fevers , coughs , vomiting and shortness of breath , according to the CDC report that examined the patients . Six of them were admitted to the intensive care unit and four required mechanical ventilation . See an explanation of H1N1 flu '' Five of them were pregnant -- two of the fetuses did not survive . Earlier this month , Judy Dominguez Trunnell became the first U.S. resident to die from complications of the H1N1 flu . Her daughter was delivered via emergency Caesarean section . Dominguez Trunnell felt body aches and numbing in the left side of her face and went to the hospital , her husband , Steven Trunnell , told CNN 's Larry King . Watch the interview . '' Trunnell has filed a wrongful death claim against Smithfield Foods , a
-LRB- CNN -RRB- -- Health officials say the H1N1 virus , commonly known as the swine flu , is likely to cause more illnesses and deaths in the United States , even though much of the initial anxiety has eased . A researcher investigates swine flu at the Centers for Disease Control and Prevention in Atlanta , Georgia . The Centers for Disease Control and Prevention reported higher levels of flu activity than the average for mid-May and an unusual number of outbreaks in schools . Some clinics reported high numbers of respiratory diseases more commonly seen during the peak of flu season . `` We do think that the way the virus is spreading in the U.S. , we are not out of the woods , and the disease is continuing , '' said Dr. Anne Schuchat , interim deputy director for science and public health program at the CDC in a news conference this week . In the United States , six deaths have been linked to the swine flu , although it 's unclear whether these were caused by the virus or pre-existing conditions . Nationwide , at least 5,123 cases of H1N1 flu have been reported