Viruses are like hijackers. They permeate living, normal cells and use those cells to increase exponentially and produce other viruses like themselves. This can kill, damage, or change the cells and cause you to sick. Different viruses attack certain cells in your body like your liver, systema respiratorium, or blood.
Treatment of viral infections is quite difficult. For most viral infections, treatment can only help with symptoms it is host immune system which fight off the virus. Antibiotics do not work for viral infections. Antiviral agents are effective in treatment of viral infections. Vaccines can prevent from getting many viral diseases.

Diagnosis and the treatment of a rare disease become complex because of the circumstances that numerous health care providers may have restricted involvement with the identification of the disease condition with the diagnosis of rare diseases. Additionally, analysis before manifestation onset or diagnosis early stage in the disease can be challenging. Biopharmaceutical experts in the field have utilized new advances and the developing investigative comprehension of many rare diseases to develop and diagnose ground breaking therapies over the last 10 years. In 2015 alone, about half (47%) of novel latest drug approvals were for rare diseases. Disease specific therapies need to be developed for productive results in treatment of Rare Diseases.

viral vaccines are prepared by using the weakened (attenuated) form of virus. Although vaccines have proven pivotal against arrays of infectious viral diseases, there are still no effective vaccines against many viruses. New structural insights into the viral envelope, protein conformation, and antigenic epitopes can guide the planning of novel vaccines against challenging viruses. Recent studies demonstrated that applications of this structural information can solve a number of the vaccine conundrums. recent advances in structure-based vaccine design, or structural vaccinology, for novel and innovative viral vaccine design and information can solve some of the vaccine conundrums.

Skin disorders differ significantly in indications and brutality. Rare skin diseases are mostly genetic. Genodermatoses are genetic skin disorders with cutaneous expression.  The Genodermatoses & Rare Skin Diseases therapeutic centres targeted mainly genodermatoses with a high effect on quality of life of patients and of their families and leading to a huge social handicap. There are many rare skin diseases like Atopic dermatitis(categorized by chronic inflammation of the skin), Epidermolysis Bullosa (inherited disorders in which the skin and mucous crusts are very delicate that the lightest touch can cause very painful), Icthyosis (dry, thickened, scaling skin).. 

The immune system is delegated to defend the body from attacks from outside or inside. Many diseases can affect immune system reducing its ability to defend self or inducing an abnormal response against external or internal antigens. Rare diseases affecting immune system present some issue in common with other rare diseases and some peculiarities due to the huge variability in the disease's expression. However, a correct estimation of the epidemiology of rare disorders is necessary for evaluating the prognosis and the responses to new therapies, for planning proper public health services, and finally to establish fair and sustainable prices for innovative medicines. The immune system is delegated to defend the body from attacks from outside or inside. Many diseases can affect immune system reducing its ability to defend self or inducing an abnormal response against external or internal antigens. 

Microbiology is the study of microorganisms, those being unicellular (single cell), multicellular (cell colony), or acellular (lacking cells). Microbiology encompasses numerous sub-disciplines including virology, bacteriology, protistology, mycology, immunology, and parasitology.

Mycology is the branch of biology concerned with the study of fungi, including their genetic and biochemical properties, their taxonomy, and their use to humans as a source for tinder, traditional medicine, food, and entheogens, as well as their dangers, such as toxicity or infection.

Parasitology is the study of parasites, their hosts, and the relationship between them. As a biological discipline, the scope of parasitology is not determined by the organism or environment in question but by their way of life.

Coronavirus disease (COVID-19) is an infectious disease caused by a newly discovered coronavirus. The virus that causes COVID-19 is mainly transmitted through droplets generated when an infected person coughs, sneezes, or exhales. These droplets are too heavy to hang in the air and quickly fall on floors or surfaces.

An orphan drug is a pharmaceutical agent developed to treat medical conditions which, because they are so rare, would not be profitable to produce without government assistance. The conditions are referred to as orphan diseases.