Importance and Value of Trees. Since the beginning, trees have furnished us with two of lifeâs essentials, food and oxygen. As we evolved, they provided additional necessities such as shelter, medicine, and tools. Today, their value continues to increase and more benefits of trees are being discovered as their role expands to satisfy the needs created by our modern lifestyles.
However, the most serious is called psittacosis. With this disease, an agent called Chlamydia psittaci causes it, and the disease is also called ornithosis. Birds can be asymptomatic carriers, and may only fall ill when upset, as stress is a major component in all avian diseases.
Transmission. 1  Generally people who get CSD are bitten or scratched by a cat before they get sick. 2  Fleas are responsible for transmitting B. henselae between cats. 3  Kittens are more likely to be infected and therefore able to pass the bacteria to humans than adult cats.