The notion of avidity has its origin in avid. East adjective (eager), from the Latin word avĭdus, rate one who is ambitious or who is eager for something.
For example: “I was always eager to know other countries”, “Greed for wealth can be healthy, but you don’t have to be greedy”, “Although the team was already winning four to zero, the Uruguayan forward continued to show his avidity”.
It can be said that greed is the craving that a person has to get something. If we refer to the first example mentioned above, greed is the wish that the subject in question has to visit different nations. In the second example, greed is associated with money ambition, which can function as an incentive to work hard and, in turn, lead to conduct that is reprehensible from a moral point of view. Finally, the third example is linked to appetite of a footballer who wants to continue scoring goals even after the triumph of his team has already been defined.
Being greedy is not positive or negative in itself: it is a circumstance or a state that can be used for the development of different kinds of Actions. The hunger for knowledge can cause a person to read a lot, take workshops, or pursue a career. In this case, greed is highly valuable. On the other hand, if the desire to have a lot of money leads a subject to steal or get involved in illicit businesses, it can be argued that his greed was negative for him and his environment.
The reading It is one of the activities that are usually linked to greed, when there is a great passion that does not allow the subject to detach himself from his favorite books. In this context it is possible to speak of avid reader, and should not be confused with someone who simply likes to read, but is someone who cannot live without it.
In the field of medicine, this term also has a meaning, more precisely when speaking of toxoplasmosis, an infection that originates from the endocellular parasite protozoan known as Toxoplasma gondii. The clinical manifestations of this infection present a great variety and one of the values that doctors must find out to make a proper diagnosis is the greed of antibody, that is, the strength of its union with multivalent epitopes, which can last several years.
Measuring the avidity of the antibody is especially useful and for this there is a so-called greed test. The initial response to infection is with a very low avidity antibody, and this results in easy dissociation from antigen binding. On the other hand, a index high is used to rule out a toxoplasmosis infection that has occurred in the past four months.
From the medical point of view, the procedure of this test does not present a marked complexity. Broadly speaking, it is an analysis during which the serum of the patient and is subjected to a duplicate processing in parallel, to obtain two readings that allow the calculation of the avidity index: one with dissociant and the other with diluent. This index must be multiplied by 100 to finally classify the result in one of the three possible bands: high greed (greater than 30%), medium greed (between 20 and 30%) and low greed(less than 20%).
Without moving away from science, we can find another use of this term that is not common in everyday speech. In this case, it can be said that the acid sulfuric has a marked greed for water, and that for this reason it is used for the drying of gases.