Image Credit: NIAID-RML
On December 31st, 2019, Chinese authorities notified the World Health Organization (WHO) of pneumonia of unknown cause detected in Wuhan, Hubei province. It was later discovered to be a novel coronavirus, now termed SARS-Cov-2.
The virus is composed of a single RNA strand and contains around 30,000 bases. Data shows that the majority of people infected experience mild symptoms, including a cough, fever, sore throat, and fatigue. However, a proportion of those infected goes on to develop more severe symptoms, including organ failure and pneumonia, which can be fatal.
At the time of publication, coronavirus disease 2019 (COVID-19) has now spread to 209 countries and provinces and confirmed infections have surpassed 3.1 million worldwide. Governments around the world are currently working hard to minimize the impact of the virus.
In addition to stringent social distancing measures introduced in many countries, testing is critical to controlling the spread of the virus. If infected individuals can be identified, they and anyone else they have recently contacted can enter quarantine to prevent onward transmission.
The WHO has repeatedly emphasized the importance of testing: “We have a simple message to all countries – test, test, test,” said WHO Director-General Tedros Adhanom Ghebreyesus at a news conference on March 16th, 2020.
The success already seen in some countries at limiting their number of cases has been attributed to early and extensive implementation of testing, for example, in South Korea and Germany. However, other countries such as the USA and UK have been slower off the mark.
An issue for all countries now is how to obtain a sufficient supply of testing kits, when the international demand for them has never been higher.
PCR Testing for Coronavirus
PCR tests are used to directly detect the presence of an antigen, rather than the presence of the body’s immune response, or antibodies. By detecting viral RNA, which will be present in the body before antibodies form or symptoms of the disease are present, the tests can show whether or not someone has the virus very early on.
The standard test for COVID-19 is based on a polymerase chain reaction (PCR). This looks for active infection with the virus through a sample from a nasopharyngeal swab or sputum. PCR is extremely reliable, offering both high sensitivity and specificity. However, PCR tests can be very labor intensive, with several stages at which errors may occur between sampling and analysis. False negatives can occur up to 30% of the time with different PCR tests, meaning they are more useful for confirming the presence of infection than giving a patient the all-clear.
PCR test kits were rapidly available once the scientific community became aware of the novel coronavirus. In a testament to the advances of science, the genomic sequence was available within weeks of the initial outbreak being reported. By contrast, during the SARS outbreak of 2003, which was also caused by a coronavirus, the genetic sequence was not determined for almost six months.
Before running a PCR test, the RNA in a virus has to be turned into a DNA copy. Then, the primers look for the target regions within a gene. If a target is present, these regions are copied over and over. Each time a copy is made of the target DNA, the light will be emitted. If there is a lot of light, this indicates the presence of the genetic material that identifies the virus, meaning a person has tested positive for COVID-19.
Most kits have at least two primers as targets to improve the reliability of the result. These primers and probes play a crucial role in the PCR test kits and scaling up efficiently to meet the high demand is critical.
Various laboratories, companies, and public health authorities have used genomic information on the virus to design primers and probes for PCR. In the USA, where the Centers for Disease Control’s testing kits proved faulty, the Food and Drug Administration (FDA) has since allowed companies and institutions to produce and distribute their own testing kits. So far, 28 companies have been approved to do so by the FDA.
As laboratories around the world scale up their production of PCR test kits to aid the global fight against the virus, improvements to the workflow for producing testing kits are urgently needed to increase the efficiency of test kit production.
In-built Evaporation Efficiency
SP-Genevac is a world-leading manufacturer of centrifugal evaporators. The company offers a range of parallel evaporators to suit various sample throughput and applications, including oligo synthesis and purification. There are many patented technologies built into these systems for sample protection.
The HT Series 3i evaporator range offers an ideal solution to improving the efficiency of test kit production, by preventing bottlenecks in high-throughput processing of oligonucleotides. It provides a fast and reliable method for drying primers and probes ready for use in PCR testing kits.
Image credit: SP Scientific
The range facilitates parallel evaporation and freeze-drying options and has the flexibility to accommodate a variety of sample formats, such as sample blocks for tubes and vials, one-piece holders for larger tubes, bottles and flask, and FastStack microplate holders. All evaporators in the range come in-built with Genevac’s Dri-Pure anti-bumping sample protection. Additional reassurance comes from SampleGuard temperature control, which prevents samples from overheating when evaporation is complete.
This advanced technology is brought together in one sleek device that offers full customization through an intuitive, easy-to-use, touchscreen interface.
References and Further Reading
About SP Scientific Products
SP Scientific is the synergistic collection of well-known, well-established, and highly regarded scientific equipment brands — VirTis, FTS Systems, Hotpack, Hull, Genevac, PennTech, and most recently i-Dositecno — joined to create one of the largest and most experienced companies in freeze-drying/lyophilization, production fill-finish lines, centrifugal evaporation and concentration, temperature control/thermal management, glassware washers and controlled environments.
More than a scientific equipment supplier, SP Scientific represents brands that distinguish themselves by thoroughly assist customers in matching equipment to particular application needs. Fortune 500, pharmaceutical, aerospace, automotive, medical device, diagnostic kit, and biotechnology companies — as well as government facilities, universities, and colleges, are among the organizations served on a daily basis.
SP Scientific is part of SP Industries, Inc., a leading designer, and manufacturer of state-of-the-art laboratory equipment, pharmaceutical manufacturing solutions, laboratory supplies and instruments, and specialty glassware. SP's products support research and production across divers end-user markets including pharmaceutical, scientific research, industrial, aeronautic, semiconductor, and healthcare.
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