Delta Pronunciation: (del-ta). Delta letter quick facts. Delta is the fourth letter (Greek letter #4) in the modern day Greek alphabet. The Delta letter appears before Greek letter Epsilon which is pronounced (ep-si-lon), and after the letter Gamma which is pronounced (gam-ah). Delta Letter Template size: 600 X 600 pixels. Greek letter set: #1 to #12 (12 color combinations).
The most common disease-causing agents are viruses, bacteria, protozoa, and parasitic worms. Viruses are not living, but do get transferred between living organisms. The West Nile Virus is transferred from mosquitoes to humans. Vaccines are a good way to prevent the spread of viruses.iruses are the disease-causing agent that most people are familiar with. They cause colds, the flu, HIV, meningitis, polio, chicken pox, rabies, West Nile, and a number of other diseases. Viruses themselves aren't living things, but they do get transmitted between living organisms.
Pathogens are easily called as infectious agents. We contact pathogens in our daily life. These are microorganisms that cause diseases in host plants and animals; e.g. virus, bacteria, and fungi. Not all microbes are harmful; pathogens refer specifically to the ones that can cause disease in the host.t causes our immune system to produce the antibody against it. Antibody is used by the immune system to identify and neutralize the foreign particles like bacteria and viruses. Basically, antigens are categorized as self-antigen and non-self-antigen.