scholarly journals First Report of Enterocytozoon hepatopenaei Infection in Pacific Whiteleg Shrimp (Litopenaeus vannamei) Cultured in Korea

Animals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3150
Author(s):  
Bo-Seong Kim ◽  
Gwang-Il Jang ◽  
Su-Mi Kim ◽  
Young-Sook Kim ◽  
Yu-Gyeong Jeon ◽  
...  
Keyword(s):  
Growth Retardation ◽  
Litopenaeus Vannamei ◽  
Inflammatory Responses ◽  
Microsporidian Parasite ◽  
First Report ◽  
South Korean ◽  
Control And Prevention ◽  
Whiteleg Shrimp ◽  
Enterocytozoon Hepatopenaei ◽  
Important Disease

The consumption of cultured crustaceans has been steadily increasing, and Pacific whiteleg shrimp (Litopenaeus vannamei) are major cultivated invertebrates worldwide. However, shrimp productivity faces a variety of challenges, mainly related to outbreaks of lethal or growth retardation-related diseases. In particular, hepatopancreatic microsporidiosis caused by the microsporidian parasite Enterocytozoon hepatopenaei (EHP) is an important disease associated with growth retardation in shrimp. Here, we report the detection of EHP through histopathological, molecular and electron microscopy methods in the hepatopancreas of Pacific whiteleg shrimp with growth disorder in a South Korean farm. Phylogenetic analysis showed a clade distinct from the previously reported EHP strains isolated in Thailand, India, China and Vietnam. An EHP infection was not associated with inflammatory responses such as hemocyte infiltration. Although EHP infection has been reported worldwide, this is the first report in the shrimp aquaculture in Korea. Therefore, an EHP infection should be managed and monitored regularly for effective disease control and prevention.

scholarly journals Clinical Investigation and Molecular Diagnosis of Microsporidian Enterocytozoon hepatopenaei (EHP) in Shrimps from Selangor, Malaysia

2021 ◽  
Vol 5 (2) ◽  
pp. 67-75
Author(s):  
Shamala Marimuthu ◽  
Chandramathi Samudi Raju ◽  
Subha Bhassu
Keyword(s):  
Growth Retardation ◽  
Clinical Investigation ◽  
Preliminary Investigation ◽  
Environmental Parameters ◽  
18S Rrna Gene ◽  
Rrna Gene ◽  
Microsporidian Parasite ◽  
Minimum Spanning Network ◽  
Positive Rate ◽  
Enterocytozoon Hepatopenaei

In recent years, shrimp aquaculture production in Southeast Asia countries was highly infected by, microsporidian parasite, EHP. Recently, shrimps from farms located in Selangor were encountering growth retardation and it highly concerned us to carry out a clinical investigation in both farms (Location A and B). EHP infected P. monodon samples were collected from both locations. A total of 43 shrimp samples were collected and diagnosed via PCR using the 18S rRNA gene. Environmental parameters were found relatively higher than the advised values. It indicates that the farms are highly infected and toxic which had led to growth retardation and mortality. However, no significant differences were observed (except water temperatures) between the locations. The phylogenetic analysis expressed EHP detected from Malaysia formed in one clade and all the reference sequences clustered based on geographical continents (Asian-Latin America). Minimum-spanning network analysis shows that Malaysia samples Location A are genetically related with other Asian EHP samples even though the total positive rate of EHP infection was lower. However, samples from Location B were not clustered within the EHP clade and shows the highest genetic variance within Malaysia and among Asian samples. This preliminary investigation results confirmed the incidence of EHP outbreak in Malaysia.

scholarly journals The microsporidian Enterocytozoon hepatopenaei is not the cause of white feces syndrome in whiteleg shrimp Penaeus (Litopenaeus) vannamei

2013 ◽  
Vol 9 (1) ◽  
pp. 139 ◽  
Author(s):  
Amornrat Tangprasittipap ◽  
Jiraporn Srisala ◽  
Saisunee Chouwdee ◽  
Montagan Somboon ◽  
Niti Chuchird ◽  
...  
Keyword(s):  
Litopenaeus Vannamei ◽  
Whiteleg Shrimp ◽  
Enterocytozoon Hepatopenaei

Label-free proteomic analysis revealed the mechanisms of protein oxidation induced by hydroxyl radicals in whiteleg shrimp (Litopenaeus vannamei) muscle

2021 ◽  
Author(s):  
Hui-min Lin ◽  
Xue-er Qi ◽  
Shan-shan Shui ◽  
Soottawat Benjakul ◽  
Santiago P. Aubourg ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Hydroxyl Radicals ◽  
Litopenaeus Vannamei ◽  
Protein Oxidation ◽  
Proteomic Analysis ◽  
Muscle Proteins ◽  
Label Free ◽  
Whiteleg Shrimp ◽  
The Stability ◽  
Oxidative Effects

The oxidative effects of hydroxyl radicals derived from a FeCl3/ascorbic acid/H2O2 system on the stability of muscle proteins in peeled shrimp (Litopenaeus vannamei) were investigated.

scholarly journals The South Korean Government’s Response to Combat COVID-19 Misinformation: Analysis of “Fact and Issue Check” on the Korea Centers for Disease Control and Prevention Website

2021 ◽  
pp. 101053952110147
Author(s):  
Yaena Song ◽  
Linda Ko ◽  
Sou Hyun Jang
Keyword(s):  
Health Care ◽  
Disease Control ◽  
Health Care Professionals ◽  
Government Agencies ◽  
Future Studies ◽  
South Korean ◽  
Control And Prevention ◽  
Social Media Platforms ◽  
Fact Checking ◽  
Centers For Disease Control

This study aimed to examine the types of misinformation spreading in South Korea during the coronavirus disease 2019 (COVID-19) pandemic by exploring the fact-checking posts uploaded on the Korea Centers for Disease Control and Prevention (KCDC) website. We conducted a content analysis of the posts written on the KCDC website titled, “COVID-19: Fact and Issue Check,” from February to August 2020 (n = 81). Two coders individually coded the posts using a codebook. Discrepancies in coding were discussed to reach reconciliation. Fifteen different Korean government agencies used the KCDC platform to refute various topics of COVID-19 misinformation, including policy (42.0%), how to prevent the spread (16.0%), health care professionals (12.3%), testing (11.1%), prevention (self-care) (9.9%), masks (8.6%), confirmed cases (8.6%), statistics (3.7%), self-quarantine (2.5%), and treatment (1.2%). We found that there are more dissemination and correction of nonmedical areas of COVID-19 misinformation than medical areas in Korea. Future studies need to examine to what extent the corrected COVID-19 misinformation has been disseminated on different social media platforms, beyond the KCDC website.

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