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Wuri N, Gou H, Zhang B, Wang M, Wang S, Zhang W, He H, Fan X, Zhang C, Liu Z, Geri L, Shen H, Zhang J. Lactate is useful for the efficient replication of porcine epidemic diarrhea virus in cell culture. Front Vet Sci 2023; 10:1116695. [PMID: 36861007 PMCID: PMC9968725 DOI: 10.3389/fvets.2023.1116695] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 01/24/2023] [Indexed: 02/16/2023] Open
Abstract
Porcine epidemic diarrhea virus (PEDV) is a deadly pathogen infecting pig herds, and has caused significant economic losses around the world. Vaccination remains the most effective way of keeping the PEDV epidemic under control. Previous studies have shown that the host metabolism has a significant impact on viral replication. In this study, we have demonstrated that two substrates of metabolic pathway, glucose and glutamine, play a key role in PEDV replication. Interestingly, the boosting effect of these compounds toward viral replication appeared to be dose-independent. Furthermore, we found that lactate, which is a downstream metabolite, promotes PEDV replication, even when added in excess to the cell culture medium. Moreover, the role of lactate in promoting PEDV was independent of the genotype of PEDV and the multiplicity of infection (MOI). Our findings suggest that lactate is a promising candidate for use as a cell culture additive for promoting PEDV replication. It could improve the efficiency of vaccine production and provide the basis for designing novel antiviral strategies.
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Affiliation(s)
- Nile Wuri
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
| | - Hongchao Gou
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,Maoming Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Maoming, China
| | - Bin Zhang
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
| | - Menglu Wang
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Songqi Wang
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Weixiao Zhang
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Haiyan He
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
| | - Xuelei Fan
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Chunhong Zhang
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,Maoming Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Maoming, China
| | - Zhicheng Liu
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,Maoming Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Maoming, China
| | - Letu Geri
- College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot, China
| | - Haiyan Shen
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,Maoming Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Maoming, China,Haiyan Shen ✉
| | - Jianfeng Zhang
- Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China,Maoming Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Maoming, China,*Correspondence: Jianfeng Zhang ✉
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Mashin VV, Sergeev AN, Martynova NN, Oganov MD, Sergeev AA, Kataeva VV, Zagidullin NV. Ensuring Viral Safety of Equine Immunoglobulins during Production. Pharm Chem J 2022; 56:283-288. [PMID: 35571872 PMCID: PMC9076163 DOI: 10.1007/s11094-022-02632-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Indexed: 11/24/2022]
Abstract
Equine blood plasma/serum and intermediates must be monitored for the presence of live viruses pathogenic in humans during production of equine immunoglobulins. Information concerning low-cost and simple methods for the detection of live horse viruses pathogenic and non-pathogenic to humans was gained using data of modern domestic and foreign literature. These methods are based on cultivation of these viruses on sensitive biosystems. The presented information can be used to set up blood plasma/serum control of horses at different stages of immunoglobulin production, i.e., when taking blood from horses during their quarantine period, when collecting blood from immunized horses, and before bottling the medicinal intermediate in the primary package.
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Affiliation(s)
- V. V. Mashin
- Microgen Scientific Industrial Company for Immunobiological Medicines JSC, 10 2nd Volkonskii Pereulok, Moscow, 127473 Russia
| | - A. N. Sergeev
- Microgen Scientific Industrial Company for Immunobiological Medicines JSC, 10 2nd Volkonskii Pereulok, Moscow, 127473 Russia
| | - N. N. Martynova
- Microgen Scientific Industrial Company for Immunobiological Medicines JSC, 10 2nd Volkonskii Pereulok, Moscow, 127473 Russia
| | - M. D. Oganov
- Microgen Scientific Industrial Company for Immunobiological Medicines JSC, 10 2nd Volkonskii Pereulok, Moscow, 127473 Russia
| | - A. A. Sergeev
- AVVAPharmaceuticals Ltd., Representative Moscow Office, Office 8, 4/3 Aviamotornaya St., Moscow, 111116 Russia
| | - V. V. Kataeva
- Microgen Scientific Industrial Company for Immunobiological Medicines JSC, 10 2nd Volkonskii Pereulok, Moscow, 127473 Russia
| | - N. V. Zagidullin
- Microgen Scientific Industrial Company for Immunobiological Medicines JSC, 10 2nd Volkonskii Pereulok, Moscow, 127473 Russia
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High-Titer Hepatitis C Virus Production in a Scalable Single-Use High Cell Density Bioreactor. Vaccines (Basel) 2022; 10:vaccines10020249. [PMID: 35214707 PMCID: PMC8880717 DOI: 10.3390/vaccines10020249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/22/2022] [Accepted: 01/28/2022] [Indexed: 02/04/2023] Open
Abstract
Hepatitis C virus (HCV) infections pose a major public health burden due to high chronicity rates and associated morbidity and mortality. A vaccine protecting against chronic infection is not available but would be important for global control of HCV infections. In this study, cell culture-based HCV production was established in a packed-bed bioreactor (CelCradle™) aiming to further the development of an inactivated whole virus vaccine and to facilitate virological and immunological studies requiring large quantities of virus particles. HCV was produced in human hepatoma-derived Huh7.5 cells maintained in serum-free medium on days of virus harvesting. Highest virus yields were obtained when the culture was maintained with two medium exchanges per day. However, increasing the total number of cells in the culture vessel negatively impacted infectivity titers. Peak infectivity titers of up to 7.2 log10 focus forming units (FFU)/mL, accumulated virus yields of up to 5.9 × 1010 FFU, and a cell specific virus yield of up to 41 FFU/cell were obtained from one CelCradle™. CelCradle™-derived and T flask-derived virus had similar characteristics regarding neutralization sensitivity and buoyant density. This packed-bed tide-motion system is available with larger vessels and may thus be a promising platform for large-scale HCV production.
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Rizvi A, Hussain N, Anjum AA, Ahmed N, Naeem A, Khan M, Altaf I. Effect of cell density on the biological titer and yield of 146S fraction of foot-and-mouth disease virus O in cell suspension. J Virol Methods 2021; 300:114379. [PMID: 34826516 DOI: 10.1016/j.jviromet.2021.114379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 07/18/2021] [Accepted: 11/22/2021] [Indexed: 01/28/2023]
Abstract
Foot-and-mouth disease (FMD) is a highly infectious disease of cattle and other cloven-hoofed animals, causing huge economic losses annually worldwide. This disease is endemic in Pakistan where the serotypes of the foot-and-mouth disease virus (FMDV) are A, O and ASIA-1. At present, trivalent FMDV vaccines are being used to prevent FMD but the current production process is laborious and is unable to fulfill the needs of the meat and dairy industries. To meet the vaccine needs of Pakistan, the conventional method of using adherent cell lines to produce the vaccine could be replaced by suspension cell cultures which produce higher yields in less time and less volume. Therefore, the aim of this study was to investigate and optimize some of the factors that affect viable cell density and subsequent virus yield. The relationship between the yield of the 146S fraction and the TCID50 of the virus preparations obtained was also evaluated as a mean to control and check the quality of the vaccine product. The results provided optimized conditions for vaccine production using cell suspensions and showed that there was a linear relationship between TCID50 and 146S fraction yield. Either TCID50 or the 146S fraction yield, or both could be used as parameters for quality monitoring during vaccine production. Using TCID50 reduced the number of steps involved in virus production while measuring 146S fraction yield was useful for quality control. However, more studies are required to evaluate the relative effectiveness of vaccines produced by virus cultures using either TCID50 or 146S fraction as quality monitoring tools.
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Affiliation(s)
- Azka Rizvi
- Department of Microbiology, Quality Operations Laboratory, University of Veterinary & Animal Sciences, Lahore, Pakistan; Department of Microbiology, Pakistan Kidney and Liver Institute & Research Center (PKLI & RC), Lahore, Pakistan
| | - Nadir Hussain
- Department of Microbiology, Quality Operations Laboratory, University of Veterinary & Animal Sciences, Lahore, Pakistan
| | - Aftab Ahmed Anjum
- Department of Microbiology, Quality Operations Laboratory, University of Veterinary & Animal Sciences, Lahore, Pakistan
| | - Naveed Ahmed
- Department of Medical Microbiology and Parasitology, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, 16150 Kota Bharu, Kelantan, Malaysia
| | - Ayesha Naeem
- Department of Microbiology, Quality Operations Laboratory, University of Veterinary & Animal Sciences, Lahore, Pakistan; Department of Microbiology, Pakistan Kidney and Liver Institute & Research Center (PKLI & RC), Lahore, Pakistan
| | - Madiha Khan
- Faculty of Life Sciences, University of Central Punjab, Lahore, Pakistan
| | - Imran Altaf
- Department of Microbiology, Quality Operations Laboratory, University of Veterinary & Animal Sciences, Lahore, Pakistan.
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Park S, Kim JY, Ryu KH, Kim AY, Kim J, Ko YJ, Lee EG. Production of a Foot-and-Mouth Disease Vaccine Antigen Using Suspension-Adapted BHK-21 Cells in a Bioreactor. Vaccines (Basel) 2021; 9:vaccines9050505. [PMID: 34068378 PMCID: PMC8153295 DOI: 10.3390/vaccines9050505] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 05/08/2021] [Accepted: 05/11/2021] [Indexed: 12/15/2022] Open
Abstract
The baby hamster kidney-21 (BHK-21) cell line is a continuous cell line used to propagate foot-and-mouth disease (FMD) virus for vaccine manufacturing. BHK-21 cells are anchorage-dependent, although suspension cultures would enable rapid growth in bioreactors, large-scale virus propagation, and cost-effective vaccine production with serum-free medium. Here, we report the successful adaptation of adherent BHK-21 cells to growth in suspension to a viable cell density of 7.65 × 106 cells/mL on day 3 in serum-free culture medium. The suspension-adapted BHK-21 cells showed lower adhesion to five types of extracellular matrix proteins than adherent BHK-21 cells, which contributed to the suspension culture. In addition, a chemically defined medium (selected by screening various prototype media) led to increased FMD virus production yields in the batch culture, even at a cell density of only 3.5 × 106 cells/mL. The suspension BHK-21 cell culture could be expanded to a 200 L bioreactor from a 20 mL flask, which resulted in a comparable FMD virus titer. This platform technology improved virus productivity, indicating its potential for enhancing FMD vaccine production.
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Affiliation(s)
- Soonyong Park
- Bioprocess Engineering Center, KRIBB, 30 Yeongudanjiro Ochang-eup, Chungju-si 28116, Korea; (S.P.); (J.Y.K.); (K.-H.R.); (J.K.)
| | - Ji Yul Kim
- Bioprocess Engineering Center, KRIBB, 30 Yeongudanjiro Ochang-eup, Chungju-si 28116, Korea; (S.P.); (J.Y.K.); (K.-H.R.); (J.K.)
- Department of Bioprocess Engineering, Korea University of Science and Technology (UST), Daejeon 34113, Korea
| | - Kyoung-Hwa Ryu
- Bioprocess Engineering Center, KRIBB, 30 Yeongudanjiro Ochang-eup, Chungju-si 28116, Korea; (S.P.); (J.Y.K.); (K.-H.R.); (J.K.)
| | - Ah-Young Kim
- Center for FMD Vaccine Research, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea; (A.-Y.K.); (Y.-J.K.)
| | - Jaemun Kim
- Bioprocess Engineering Center, KRIBB, 30 Yeongudanjiro Ochang-eup, Chungju-si 28116, Korea; (S.P.); (J.Y.K.); (K.-H.R.); (J.K.)
- Department of Bioprocess Engineering, Korea University of Science and Technology (UST), Daejeon 34113, Korea
| | - Young-Joon Ko
- Center for FMD Vaccine Research, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea; (A.-Y.K.); (Y.-J.K.)
| | - Eun Gyo Lee
- Bioprocess Engineering Center, KRIBB, 30 Yeongudanjiro Ochang-eup, Chungju-si 28116, Korea; (S.P.); (J.Y.K.); (K.-H.R.); (J.K.)
- Correspondence: ; Tel.: +82-043-240-6633
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Kim AY, Kim H, Park SY, Park SH, Lee JM, Kim JS, Park JW, Park CK, Park JH, Ko YJ. Investigation of the optimal medium and application strategy for foot-and-mouth disease vaccine antigen production. J Appl Microbiol 2021; 131:1113-1122. [PMID: 33544957 DOI: 10.1111/jam.15024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 11/03/2020] [Accepted: 02/01/2021] [Indexed: 12/14/2022]
Abstract
AIMS For the effective production of 146S particles, which determines foot-and-mouth disease (FMD) vaccine efficacy, we aimed to identify the optimal medium that is easy-to-use, productive and economically affordable for the large-scale production of FMD vaccine. METHODS AND RESULTS Nine combinations of cell growth media and replacement media were tested for virus propagation. Apart from the replacement strategy, we tested a simple addition strategy involving the addition of 30% v/v of fresh medium to the total spent medium using the Cellvento BHK-200 (Vento). Unlike other tested media that produced poor yields of 146S particles when the spent media were not eliminated, Vento exhibited high productivity with the 30% addition strategy. CONCLUSIONS Considering its lower price and media consumption compared to those of other media that require media replacement, the 30% addition strategy of Vento is highly effective. Furthermore, owing to its simple application strategy, it makes the scale-up process easy and helps in saving the time and labour involved in spent media removal. SIGNIFICANCE AND IMPACT OF THE STUDY Through the first comparative assessment of commercial media for the 146S particle recovery, this study suggests the best practical medium for the industrial-scale production of FMD vaccines.
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Affiliation(s)
- A-Y Kim
- Animal and Plant Quarantine Agency, Gimcheon, Gyeonsangbuk-do, Republic of Korea
| | - H Kim
- Animal and Plant Quarantine Agency, Gimcheon, Gyeonsangbuk-do, Republic of Korea.,College of Veterinary Medicine & Animal Disease Intervention Center, Kyungpook National University, Daegu, Republic of Korea
| | - S Y Park
- Animal and Plant Quarantine Agency, Gimcheon, Gyeonsangbuk-do, Republic of Korea
| | - S H Park
- Animal and Plant Quarantine Agency, Gimcheon, Gyeonsangbuk-do, Republic of Korea
| | - J-M Lee
- Animal and Plant Quarantine Agency, Gimcheon, Gyeonsangbuk-do, Republic of Korea
| | - J-S Kim
- Animal and Plant Quarantine Agency, Gimcheon, Gyeonsangbuk-do, Republic of Korea
| | - J-W Park
- Animal and Plant Quarantine Agency, Gimcheon, Gyeonsangbuk-do, Republic of Korea
| | - C-K Park
- College of Veterinary Medicine & Animal Disease Intervention Center, Kyungpook National University, Daegu, Republic of Korea
| | - J-H Park
- Animal and Plant Quarantine Agency, Gimcheon, Gyeonsangbuk-do, Republic of Korea
| | - Y-J Ko
- Animal and Plant Quarantine Agency, Gimcheon, Gyeonsangbuk-do, Republic of Korea
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Host cell glutamine metabolism as a potential antiviral target. Clin Sci (Lond) 2021; 135:305-325. [PMID: 33480424 DOI: 10.1042/cs20201042] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 12/08/2020] [Accepted: 01/04/2021] [Indexed: 12/20/2022]
Abstract
A virus minimally contains a nucleic acid genome packaged by a protein coat. The genome and capsid together are known as the nucleocapsid, which has an envelope containing a lipid bilayer (mainly phospholipids) originating from host cell membranes. The viral envelope has transmembrane proteins that are usually glycoproteins. The proteins in the envelope bind to host cell receptors, promoting membrane fusion and viral entry into the cell. Virus-infected host cells exhibit marked increases in glutamine utilization and metabolism. Glutamine metabolism generates ATP and precursors for the synthesis of macromolecules to assemble progeny viruses. Some compounds derived from glutamine are used in the synthesis of purines and pyrimidines. These latter compounds are precursors for the synthesis of nucleotides. Inhibitors of glutamine transport and metabolism are potential candidate antiviral drugs. Glutamine is also an essential nutrient for the functions of leukocytes (lymphocyte, macrophage, and neutrophil), including those in virus-infected patients. The increased glutamine requirement for immune cell functions occurs concomitantly with the high glutamine utilization by host cells in virus-infected patients. The development of antiviral drugs that target glutamine metabolism must then be specifically directed at virus-infected host cells to avoid negative effects on immune functions. Therefore, the aim of this review was to describe the landscape of cellular glutamine metabolism to search for potential candidates to inhibit glutamine transport or glutamine metabolism.
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Dill V, Ehret J, Zimmer A, Beer M, Eschbaumer M. Cell Density Effects in Different Cell Culture Media and Their Impact on the Propagation of Foot-And-Mouth Disease Virus. Viruses 2019; 11:v11060511. [PMID: 31167384 PMCID: PMC6631978 DOI: 10.3390/v11060511] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 05/16/2019] [Accepted: 06/04/2019] [Indexed: 12/19/2022] Open
Abstract
Foot-and-mouth disease virus (FMDV) is endemic in many parts of the world. Vaccination is an important control measure, limits viral spread, and can help to eradicate the disease. However, vaccination programs are cost-intensive because of the short shelf life of vaccines and the need for frequent re-vaccination. Animal-component-free (ACF) or chemically defined media (CDM) at high cell densities are a promising approach for the production of inexpensive high-quality vaccines, but the occurrence of cell density effects has been reported for various virus-cell systems in vaccine production. For FMDV, the use of CDM or ACF media for vaccine production has not been studied and no information about cell density effects is available. This work describes the propagation of FMDV in ACF or in CDM. Cells were grown at increasing cell densities and either 100% media exchange or addition of 30% fresh media was performed before infection with FMDV. Increasing cell densities reduced the viral titer and increased yield variability in all media except BHK300G. This effect can be mitigated by performing a 100% media exchange before infection or when using the controlled environment of a bioreactor. The media composition and also a fragile relationship between virus and cell metabolism seem to be causal for that phenomenon.
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Affiliation(s)
- Veronika Dill
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany.
| | - Janike Ehret
- Merck KGaA, Merck Life Sciences, Upstream R&D, Frankfurter Straße 250, 64293 Darmstadt, Germany.
| | - Aline Zimmer
- Merck KGaA, Merck Life Sciences, Upstream R&D, Frankfurter Straße 250, 64293 Darmstadt, Germany.
| | - Martin Beer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany.
| | - Michael Eschbaumer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany.
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