The current outbreak of Coronavirus disease 2019 (COVID-19) has become a health emergency of international concern since last December 2019. At the same time, the coronavirus pandemic also caused an economic crisis worldwide. All countries worldwide are competing to generate a qualified strategic plan for resolving this problem. Vaccine, treatment, and detection are the keys to control this pandemic. Global attempts to produce a suitable vaccine are ongoing in many laboratories. However, based on the failure of several previous vaccines, such as Ebola and dengue fever, has stimulated researchers to develop an effective and quick treatment. Effective treatment depends on the effectiveness of the detection method. Thus, a real-time, selective, and accurate detection method is urgently needed to detect if a person has been exposed to COVID-19. This paper is designed to discuss the current situation in controlling COVID-19 by several detection methods. The progress of each method is summarized and compared. Other information regarding the virus, such as the origin, transmission, and biomarkers of the virus, is also explained. The case progress of COVID-19 and its future directions also are discussed.

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In this paper, a load effect on a singlemode-multimode-singlemode (SMS) fiber structure embedded in a high-density polyethylene (HDPE) was investigated numerically and experimentally. It was modelled that the applied load induces a longitudinal strain on the HDPE and accordingly affects the SMS fiber structure's parameters. It was calculated the output power of the SMS fiber structure using a graded index multimode fiber (MMF) due to the applied strain from 0 to 4000 N. The experimental result shows that for the MMF length of 105 mm, the output power has monotonically increasing for an applied load range from 1700 to 4000 N with a sensitivity of 1.18 x 10 -3 dBm/N. This configuration of SMS fiber structure embedded in the HDPE is potential for a load sensor.