A person may be a carrier of a disease, such as Streptococcus in the throat, without exhibiting any symptoms. Depending on the disease, the person may or may not be contagious during the incubation period.During clinical latency, an infection is subclinical. With respect to viral infections, in clinical latency the virus is actively replicating. person may be a carrier of a disease, such as Streptococcus in the throat, without exhibiting any symptoms. Depending on the disease, the person may or may not be contagious during the incubation period.
The first commercial deployment in North America of camera phones was in 2002. The Sprint wireless carriers deployed over 1 million camera phone manufactured by Sanyo and launched by the PictureMail infrastructure (Sha-Mail in English) developed and managed by LightSurf.
By the time the first prototype of the modern cell phone appeared in 1973, the phone was capable of being used independently and worked in multiple calling regions. Cell phones were being tested in trials in Chicago, Washington D.C. and Baltimore by 1977 and in Japan by 1979.