The infectious diseases is not perfectly drawn, as illustrated classically by tuberculosis, which is clearly transmissible from person to person, but was not classically considered a contagious disease.
Infections are caused by infectious agents including viruses, viroids, prions, bacteria, nematodes such as parasitic roundworms and pinworms, arthropods such as ticks, mites, fleas, and lice, fungi such as ringworm, and other macroparasites such as tapeworms and other helminths. The symptoms of an infection depend on the type of disease. Some signs of infection affect the whole body generally, such as fatigue, loss of appetite, weight loss, fevers, night sweats, chills, aches and pains. Others are specific to individual body parts, such as skin rashes, coughing, or a runny nose : an infectious disease communicable by contact with one who has it, with a bodily discharge of such a patient, or with an object touched by such a patient or by bodily discharges—compare communicable disease.  Communicable diseases are transmitted from one source to another by infectious bacteria or viral organisms. Contagious diseases are very communicable, spreading rapidly from one person to another via contact or close proximity. Some germs are communicable and/or contagious, while others are not, i.e. food poisoning. Contagious, communicable or noncommunicable infectious diseases, posing a health risk, have always existed. Notorious childhood contagious diseases commonly discovered running around the playground include: 1  rubella. 2  roseola. 3  scabies. 4  measles. 5  pink eye. 6  ringworm. 7  chickenpox. 8  scarlet fever. 9  fifth disease. 10  hand-foot-and-mou Specific medications used to treat infections include antibiotics, antivirals, antifungals, antiprotozoals, and antihelminthics. Infectious diseases resulted in 9.2 million deaths in 2013 (about 17% of all deaths). The symptoms of an infection depend on the type of disease. Some signs of infection affect the whole body generally, such as fatigue, loss of appetite, weight loss, fevers, night sweats, chills, aches and pains. Others are specific to individual body parts, such as skin rashes, coughing, or a runny nose 1. Infectious: an infectious disease can be passed easily from one person to another, especially through the air they breathe. Contagious: if a person is contagious, they have a disease that can be spread to other people by touch. But, cholera and typhoid (for example) are usually spread through the environment. Cholera and typhoid fever are both termed water-and food-borne infectious diseases. (They are caused by bacteria and spread through contaminated water and food.) So, no, I would not say cholera is contagious, but it is an infectious disease. Infection is the invasion of an organism's body tissues by disease-causing agents, their multiplication, and the reaction of host tissues to these organisms and the toxins they produce. Infectious disease, also known as transmissible disease or communicable disease, is illness resulting from an infection. The symptoms of an infection depend on the type of disease. Some signs of infection affect the whole body generally, such as fatigue, loss of appetite, weight loss, fevers, night sweats, chills, aches and pains. Others are specific to individual body parts, such as skin rashes, coughing, or a runny nose The boundary between contagious and non-contagious infectious diseases is not perfectly drawn, as illustrated classically by tuberculosis, which is clearly transmissible from person to person, but was not classically considered a contagious disease. The non-contagious category of infections usually require a special mode of transmission between persons or hosts. These include need for intermediate vector species (mosquitoes that cause malaria) or by non-casual transfer of bodily fluid (such as transfusions, needle sharing or sexual contact).
https://en.wikipedia.org/wiki/Infectious_disease http://www.merriam-webster.com/medical/contagious%20disease http://www.healthblurbs.com/types-of-infectious-disease-communicable-contagious-emerging-childhood-infectious-diseases/ https://en.wikipedia.org/wiki/Infectious_disease http://english.stackexchange.com/questions/64122/difference-between-infectious-and-contagious https://en.wikipedia.org/wiki/Infectious_disease https://en.wikipedia.org/wiki/Contagious_disease
contagious infectious diseases