Animal testing can be reduced but not replacedAnimal testing has been used since ancient times. In the last century it was used to satisfy the curiosity of many scientists who wanted to understand how the body worked. This scientist made many medical discoveries. For example, every time someone takes antibiotics, receives a blood transfusion, undergoes surgery or chemotherapy, they have just received benefits from research that began with animal testing. Nowadays animal testing is essential in the medical field, it is necessary to test any type of medicine or procedure on animals before using it on humans. However, due to the reliability of scientists and poor regulations on animal testing, many institutions are eager to invest in the creation and development of new technologies that can minimize the use of animals. But even if the technology has been improved, it is impossible to completely replace animal testing. In the past, animals were used to analyze different models and understand the basic functions of the body like scientists do in real life. The difference between past and current animal tests is that in the past, scientists used more painful methods due to not using anesthesia. For example, many scientists discovered living animals so they could see their organs and how they worked. Many of these tests and research on animals lead to the cure of diseases and others lead to the discovery of therapies. HIV/AIDS is one of the diseases that most affects humans and is impossible to cure, but thanks to a lot of research and many treatments tested on animals, scientists can at least extend the patient's life expectancy. According to Elizabeth... half of the article... suggestions that help develop new treatments or knowledge that can guide the cure of diseases. But with some imitations that need to be clarified, animal research helps scientists see expected and not actual stages of a disease or drug. By saying expected it is certainly assumed that the result obtained by an animal may not be exactly the same as that obtained by humans due to the numerous factors that influence this result such as genetics, control of food and liquids, temperature, among others others . Technology is now an option to replace some methods used to obtain data from animals, but it is important to emphasize that technology can only reduce, not replace, the use of animal testing. Animal research is very important for the medical field and should be used to our advantage, but alternatives should be used as much as possible if available