They can be listed as:

Viruses:

Colds, flu.
Influenza.
Hepatitis.
Respiratory syncytial virus.
COVID-19
Herpes virus infections.
Adenovirus infections.
Rotavirus infections
HIV infections
Hepatitis B
Hepatitis C
Hepatitis A
Cytomegalovirus infections.

Bacteria:

Upper Respiratory Tract Infections
Sore throat,
Tuberculosis.
Pertussis
Salmonella infections.
Shigella infections.
Bronchitis
Pneumonitis
Urinary Tract Infections
Acute tonsillitis.
Acute pharyngitis.
Brunsellosis.
Meningitis
Osteomyelitis
Skin-subcutaneous tissue infections.

Myecetes cause diseases like;
Amibiasis.
Fungal nail infections.
Vaginal yeast infection.
Oral candidiasis
Tenyasis.
Parasites
Giardiasis.
Toxoplasmosis
Hookworms.
Nematoda

Who is most at risk of contracting these diseases?

Anyone can get an infectious disease. If your immune system is weak or you travel to areas with high rates of infectious diseases, you may be at risk.

People at high risk of being caught:

Those with suppressed or weakened immune systems, such as those receiving cancer treatment, those living with HIV, or those taking certain medications.

Young children, pregnant women and adults over 65 years of age.

Unvaccinated against common infectious diseases.

Health care workers

People who live in nursing homes.

Schools, kindergardens.

Military barracks.

Indoor workers

People who travel to areas where they may be exposed to mosquitoes carrying pathogens such as malaria, dengue virus and zika viruses.

What are the symptoms of diseases caused by viruses, bacteria, fungi, parasites?

Symptoms depend on the type of disease. Fungal infections often cause regional symptoms such as redness and itching. Viral and bacterial infections can show symptoms in many areas of your body, such as:

Fever
Trembling, chill.
Muscle pains
Headache
Diarrhoea.
Coughing
Burnout
Nausea
Vomiting
Sore throat,
Burning, aching while urinating.
Nasal discharge.
If you have a long-lasting symptom or symptoms that worsen over time, we recommend that you see our doctor.

How Are Infectious Diseases Diagnosed?

Doctors usually diagnose infectious diseases using one or more laboratory tests.

These may be;
Taking swab samples from nose or throat.
Taking blood, urine, stool or saliva samples.
Take a biopsy or scrape off a small sample of skin or other tissue.
Imaging of affected parts of the body.
Sowing of all kinds of body secretions and pus for culture.

How to Treat Diseases Caused by Virus, Bacteria, Fungus, Parasite?

Treatment depends on what is causing the infection. Bacterial infections are treated with antibiotics. The right antibiotic depends on which bacteria are causing the infection. Fungal infections are treated with antifungal drugs. Parasites are also treated with antiparasitic drugs.