A case report: A rare case of infant gastrointestinal canthariasis caused by larvae of Lasioderma serricorne (Fabricius, 1792) (Coleoptera: Anobiidae)
- Xi Sun†1, 2,
- Li-Fu Wang†1, 2,
- Ying Feng†1, 2,
- Hui Xie1, 2,
- Xiao-Ying Zheng1, 2,
- Ai He1, 2,
- Md Robiul Karim1, 2,
- Zhi-Yue Lv1, 2Email author and
- Zhong-Dao Wu1, 2Email author
© Sun et al. 2016
Received: 29 September 2015
Accepted: 8 April 2016
Published: 3 May 2016
Canthariasis is a disease of humans caused by the infestation of beetle larvae. It is the second important insectal disease after myiasis. Several species of beetles are reported to cause the disease in gastrointestinal tract, urogenital system, nasal sinuses, ears and faces of mammals. The cigarette beetle Lasioderma serricorne is a widespread and destructive pest that usually feeds on tobacco, tea, beans, cereal grains, and animal and plant specimen. While there was no previous evidence of human infestation by this worm, we report the first case of L. serricorne infestation in a baby girl in China.
Here the case, an eight-month-old baby girl with irritable feeling, rubbing eyes, history of contact with mud and eating oranges twice during five days before attendance, and having “worms” in her stool was admitted to the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China. The clinical examination revealed that the pulse rate, blood pressure and temperature were regular, and the examination of the head, neck, and chest were unremarkable. The stool specimens containing “worms” were sent to the Department of Parasitology, Zhongshan School of Medicine, Sun Yat-sen University. The worms were recovered, studied morphologically using naked eyes and anatomical lens, PCR analyzed targeting cytochrome oxidase subunit 1 (COX1) and 18S rRNA genes, examined by sequence analyses of the PCR products and finally classified by phylogenetic analysis to identify their species. Based on the findings, the worms were diagnosed as the larvae of L. serricorne.
This report implies that the baby had an infestation with the larvae of L. serricorne in the gastrointestine. During contact with mud or eating oranges by the girl, worm eggs were swallowed into the stomach and resisted gastric acid digestion which eventually hatched into larvae and caused canthariasis. The 8 months girl had underdeveloped immune system which might facilitate the disease. This report implicates that L. serricorne can infest human accidentally and cause canthariasis that may lead to severe damage to infant and older patient upon involvement of important organs of the body. The patients once diagnosed having canthariasis should be treated in time.
KeywordsCanthariasis Lasioderma serricorne Larvae COX1 18S rRNA
Please see Additional file 1 for translation of the abstract into the six official working languages of the United Nations.
Insectal diseases such as myiasis, scoleciasis and canthariasis are the infestations of the living or dead tissues of live vertebrates by developing larvae of the insects. Canthariasis or scarabiasis is an important insectal disease in humans caused by the beetles (coleopteran insects) or their larvae . Difference to the myiasis, this is a rare infestation with its several forms. Canthariasis, the second important insectal disease, can infect gastrointestinal tract, urogenital system, nasal sinuses, ears and faces of mammals. Several species of beetles, including Tenebrio molitor, A. piceus, T. mauritanicus, T. versicolor, C. punctatus and species of skin beetles (Coleoptera: Dermestidae) and ground beetles (Coleoptera: Carabidae) have been reported to cause canthariasis [2–7]. In 1946, Palmer reported a case of intestinal canthariasis caused by T. molitor in a man in the USA . In 1965, Scott reported that the black carpet beetle, A. piceus caused nasal cantheriasis and cadelle beetle, T. mauritanicus and large carpet beetle, T. versicolor caused enteric cantheriasis in humans in the USA. Wilson and Judd recovered a carpet beetle larva (Coleoptera: Dermestidae) from the digestive tract of an English woman in 1956 . Bhargava and Victor reported two cases of Carabid beetle (Crasydactylus punctatus Guerin) invasion of human ears in Sultanate of Oman in 1999 . Majumder and Datta recovered adult dung beetles from stool samples of 18 children from rural northeast India in 2012 . In a recent study by Smadi and associates, the drugstore beetle, S. paniceum and a beetle of the genus Trogoderma were observed to cause facial cantheriasis in a 29-year-old woman in Jordan .
In this case report, we described a rare case of canthariasis caused by the infestation of Lasioderma serricorne larvae in an 8-month baby girl admitted to the department of Parasitology, Zhong shan School of Medicine, Sun Yat-sen University, Guangzhou, China.
The case is a baby girl aged 8 months. The girl was brought to the hospital because her mother found several worms in her stool for 4 times in 3 days. Her mother was asked to answer some questions regarding age, residence, history of contact with animals or mud, and standard of living. Complete medical examinations, including the blood pressure, pulse rate and temperature, and examination of the head, neck, chest, were done in the First Affiliated Hospital of Sun Yat-sen Uuniversity, Guangzhou, China. The clinical examination revealed that the pulse rate was regular. The temperature and blood pressure were also normal. The head, neck, and chest were unremarkable. The patient felt irritable and was rubbing her eyes. She has history of contact with mud and ate oranges twice during five days before attendance. During the illness of patient, larvae were found seven times in the stool. Approximately, 21 larvae were recovered from the stool by her parents. The stool specimen containing worms was sent to the Department of Parasitology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China for identification. At the time of our re-visiting the girl, two days after attendance, her parents confirmed us that no larva was appeared during this period without medication.
In light of PCR analyses, further exploration was used to identify the larval species based on genetic characterization. Therefore, the amplified PCR products of the larval COX1 and 18S rRNA genes were sequenced. Twenty PCRs were pooled and electrophoresed on a 1 % agarose gel. The expected band was excised, purified using Agarose Gel DNA Extraction Kit (TakaRa, Japan) and sequenced by company (Invitrogen). The obtained sequences were used for homology search using the BLAST program (http://blast.ncbi.nlm.nih.gov/Blast.cgi). The BLAST results revealed that the larval COX1 and 18S rRNA gene sequences had high homology with published L. serricorne COX1 gene (Accession No. DQ222030) and 18S rRNA gene (Accession No. AY748105), respectively. The alignments produced: a score = 1515 bits (820), expect = 0.0, identities = 824/826 (99 %), gaps = 0/826 (0 %) and strand = Plus/Plus for COX1 and a score = 946 bits (512), expect = 0.0, identities = 521/525 (99 %), gaps = 2/525 (0 %) and strand = Plus/Plus for 18S rRNA. These findings suggested that the worms were L. serricorne larvae.
Several forms of cantheriasis have been described in the previous reports. Thus far, rectal canthariasis caused by adults of the family Scarabaeidae in Sudan, enteric cantheriasis by cadelle beetle, Tenebroides mauritanicus, and large carpet beetle, Trogoderma versicolor and nasal cantheriasis by black carpet beetle, Attagenus piceus in USA, otic cantheriasis by adult Crasydactylus punctatus (Coleoptera; Carabidae) in Oman and facial cantheriasis by the drugstore beetle, Stegobium paniceum, and a beetle of the genus Trogoderma in Jordan have been reported [1–3, 8]. Besides, adult dung beetles were recovered from stool samples of 18 children from rural northeast India .
Herein, we confirmed a rare case of intestinal canthariasis caused by L. serricorne in an eight months old baby girl hospitalized in the First Affiliated Hospital of Sun Yat-sen Uuniversity, Guangzhou, China.
L. serricorne, also known as cigarette beetle, is a widespread and destructive pest that has a wide range of feeding habits, including tobacco, tea, beans, cereal grains, and animal and plant specimens [10, 11]. However, there is no report of human infection by this worm. To the best of our knowledge, this is the first case report of infant canthariasis caused by L. serricorne in China, let alone possibly in the world.
In this case, the patient was a baby girl aged eight months who presented white worms in her stool, and has the history of contact with mud and ate oranges twice during five days before attendance. We isolated the worms from stool specimens and identified by the naked eyes and under microscope. We observed that the larvae were subcylindrical and bend in shape, creamy white in body color and brown in head color, and the surface was convex and smooth. We presumed that these kinds of worms might be the larvae of some insects, as the baby’s poor personal hygiene and poor state of health indicating the risk of acquiring gastrointestinal myiasis and canthariasis. As we know, the gastrointestinal myiasis and canthariasis are caused by the swallowing of fly eggs or beetle eggs accidentally without chewing by the patients; it is thought that the baby might be infected by the insect eggs when she was contacting with mud or eating oranges and without being digested in the stomach.
On our examination by anatomical lens, the characteristics of the larvae were very similar to the beetle larvae: subcylindrical in shape, “C” like in posture and creamy white in color, 2–3 mm in length and ~ 0.5 mm in width, full of plush on the dorsal and ventral surface, 3 pairs of feet with having 4 sections and nodes hocks curved claws on the belly near to the head, wrinkles on the body and tawny head. To substantiate the morphological similarity of the larvae to beetles, we examined the COX1 and 18S rRNA genes of the larvae by PCR amplification and the amplified products were identical to the expected size that illustrated the larvae as beetle larvae. Then we sequenced the COX1 and 18S rRNA genes of the larvae and the sequences were used for homology search using the BLAST program which revealed the highest sequence similarity (99 %) of the larval COX1 and 18S rRNA genes with published L. serricorne COX1 gene (Accession No. DQ222030) and 18S rRNA gene (Accession No. AY748105), respectively. The phylogenetic analyses of the larval COX1 and 18S rRNA gene sequences with reference sequences also revealed that the larvae belonged to L. serricorne. Thus, the clinical observation, morphological characteristics of the larvae, PCR findings, the genetic identity and phylogeny, all confirmed the isolated worms as L. serricorne larvae that caused canthariasis in the girl.
In summary, we reported that L. serricorne is a kind of beetle that can infest human accidentally and cause canthariasis. In this case, the patient was a girl aged 8 months who had underdeveloped immune system which might facilitate the disease. L. serricorne eggs, during contact with mud or eating oranges by the patient, were swallowed into the stomach and resisted gastric acid digestion. After entering into the intestine, the eggs hatched into larvae and caused canthariasis. The clinical symptoms of gastrointestinal canthariasis observed here were relatively light. However, canthariasis may cause severe damage to the patient (especially infant or the old people) if the larvae parasitize in some important organs of the body, such as skin and external auditory canal. The infants once diagnosed as canthariasis patients should be treated in time. It also suggests that the infants and immunocompromised persons should pay attention to personal hygiene and reduce the risk of infection with similar diseases. Furthermore, our study identified the beetle species of canthariasis in human by molecular biological methods, providing a final diagnosis method for the disease in the clinics.
This study was approved by the Human Research Ethics Committee of the Sun Yat-sen University in China and the committee’s reference number is [(2016) 025]. The parents of the patient received an explanation about the scope of the study, such as objectives, procedures, and potential risks, and signed an informed consent statement before inclusion in the study.
Written informed consent was obtained from the patient for publication of this Case Study and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
This work was supported by the National High Technology Research and Development Program of China (2015AA020934), National Natural Science Foundation of China (30972574), National Natural Science Foundation of China (81201309), China Postdoctoral Science Foundation (2011 M501363), Natural Science Foundation of Guangdong Province of China (S2012040007256) and Foundation of Doctoral Program of Higher Education of China (20120171120049) in the design of the study, collection, analysis and interpretation of data, and writing the manuscript.
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