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.
Making the world better, one answer at a time. Pathogenic diseases are caused by what is called a pathogen. Pathogens are parasitic organisms that cause disease int heir host.There are five different groups of pathogens: Viruses, bacteria, fungi, protozoans and parasitic worms. Deficiency diseases are just as the name suggests.They are caused by a deficiency of a particular nutrient in the diet. Hereditary diseases are passed on through generations via their genes.here are five different groups of pathogens: Viruses, bacteria, fungi, protozoans and parasitic worms. Deficiency diseases are just as the name suggests. They are caused by a deficiency of a particular nutrient in the diet.