Parasitic DiseaseBilharzia is a disease that is caused by parasitic worms. The parasites that usually cause bilharzia live in particular types of freshwater snails. The major challenge that is being experienced in the prevention of the disease is the lack of a vaccine (Farley, 2017). Although there is no vaccine for bilharzia, this disease is addressed in public health through which people are advised to take some preventive measures. These preventive measures include avoiding swimming in fresh water when in countries in which schistosomiasis occurs and drinking safe water. However, swimming in the ocean and in chlorinated swimming pools is considered to be safe.Infectious DiseaseInfluenza is an infectious disease that attacks a person’s respiratory system including the nose lungs and throat. This disease represents a major burden for public health because it affects all age groups with different prognoses. The major challenge that is faced in trying to prevent influenza is that the immunity that is provided from the vaccines usually wanes with the virus mutation over time which requires people to be vaccinated every year. The immunization plans of influenza need to be updated continuously in order to reduce the severe and fatal cases caused by this disease (Paules, et al., 2018). The public health sector is trying to address the challenge by ensuring people acquire an every year seasonal vaccine that provides protection from the various types of influenza.Antibiotic ResistanceOne of the antibiotic resistance situations is bacteria resistance to antibiotics. In this situation, bacteria develop resistance to antibiotics that were once treated by those antibiotics (Frieri, Kumar, & Boutin, 2017). These bacteria cause severe diseases which have made resistance to antibiotics to become a major public health issue. However, there are some ways in which people are trying to prevent antibiotic resistance for instance by practicing good hygiene, completing the entire course of any prescribed antibiotic, and minimizing unnecessary prescribing and overprescribing.