Prevalence and risk factors
A total of twenty six (8.96%, 26/290) cases out of 290 feacal samples were tested positive for the
Cryptosporidium oocysts on mZN screening (Table 1). Dark red, small, round or oval shaped oocysts were seen in feacal smear examinations of goats (Fig 1). Prevalence was higher in diarrhoeic goats (10.50%, 23/219) than non-diarrhoeic goats (4.22%, 3/71). As compare with present study
Maurya et al. (2013) reported lower prevalence of
cryptosporidium spp. in goats. Higher prevalence of
cryptosporidium spp. reported by several other workers
(Ahamed et al., 2015; Khursheed et al., 2018; Dixit et al., 2019). The lower prevalence of
Cryptosporidium spp. in the present study could be due to the variation in the sample size screened and the type of diagnostic tests used. In the present study, only staining of faecal smear with mZN stain was used. Use of more sensitive tests like polymerase chain reaction may further increase the proportion of positive samples (
Al-Robaiee and Al-Farwachi, 2013). The age-wise prevalence of
cryptosporidium was higher in 0-1 month of age (14.60%, 13/89) thereafter prevalence decreased with increasing age (Table 1). The same has been described by previous workers
(Bejan et al., 2009; Ceballos et al., 2009; Ahamed et al., 2015; Khursheed et al., 2018; Shanmathi et al., 2019). The age has been found to be the greatest influencing factor in causing
Cryptosporidium infections. Higher prevalence of
cryptosporidium infection under one month of age may be due to underdeveloped immune system and lack of maternal antibody in kids
(Paraud et al., 2014). Prevalence of
cryptosporidium was higher in female goats (10.20%, 15/147) than that of male (7.69%, 11/143). Higher prevalence in female goats in the present study were in agreement with the findings of
Ahamed et al., (2015), Maurya et al., (2013), Akinkuotu et al. (2016)
, El-Shahawy (2016),
Khan et al., (2018) and
Shanmathi et al., (2019) in goats. Contrary to present study higher prevalence of
cryptosporidium reported in male goats than female goats
(Abare et al., 2019). Higher susceptibility of infections to female goats may be due to stress associated with pregnancy, parturition and lactation
(Akinkuotu et al., 2014). This issue has been contradicted by others and stated that the prevalence of
Cryptosporidium did not significantly relate to sex of animals (
Rahman et al., 1985;
Shobhamani, 2007;
Venu et al., 2012). Season wise prevalence of
cryptosporidium spp. was higher in monsoon season (16.83) as compared to other season. Same finding were reported by
Singh et al., (2018) in calves. In addition,
Khan et al. (2018) reported higher prevalence of
Cryptosporidium in summer season. High temperature and humidity with frequent rains in the monsoon season support faster transmission of the oocysts from the infected to healthy animals
(Khan et al., 2018; Jafari et al., 2012). Parity-wise prevalence of
cryptosporidium was higher in first parity (14.28%, 17/119) than it decreased with parity of dam. Similar observations were also recorded by
Sharma and Joshi (2020) and
Singh et al. (2018) in calves. First and second parity dam have significantly lower levels of immunoglobulins in their colostrum than higher parity dam and this is the reason for higher incidence of diarrhoea in new born animals during first parity
(Logan et al., 1981; Svensson et al., 2003; Afshari et al., 2012). Since,
cryptosporidium with other polymicrobial agents are the main agents of diarrhoea so their prevalence may be influenced by parity of dams (
Millemann, 2009;
Cho and Yoon, 2014;
Meganck et al., 2015).
Hemato-biochemical changes
Hemato-biochemical parameters were recorded in 26 goats, which were found positive for
Cryptosporidium infection (Table 2 and 3). The average hemoglobin level were significantly (P<0.05) decreased in
cryptosporidium infected group (10.51±0.10) as compared the control group (11.81±0.13). These findings were in accordance with
Thakre et al. (2016) in calves and
Aziz et al., (2021) in sheep. Decrease in hemoglobin concentration might be attributed to hemoconcentration and the loss of body fluid along with electrolytes in extreme diarrheic and dehydrated condition in goats. The mean packed cell volume (PCV) values were decreased (31.80±0.25) in case of infected goats but it was not significantly related to the control group (33.10± 0.45). Same findings were reported by
Rekha et al. (2011) in calves and
Aziz et al. (2021). The total erythrocyte count were significantly (P<0.05) decreased in infected group (11.68±0.52) as compared to the corresponding value of the control group (13.89±0.56). Similar findings were observed by
Thakre et al. (2016) in calves and
Aziz et al. (2021) in sheep. The total erythrocyte count in
cryptosporidium infected goats decreased due to dehydration and hemoconcen- tration caused by diarrhoea (
Molina et al., 1994). The findings of present study that is decrease in hemoglobin, packed cell volume and total erythrocyte count were disagree with the findings of
Al-Doori (2018),
Abdel-Saeed and Salem (2019) in
cryptosporidium infection in rabbit and lambs respectively. They reported a significant increase in red blood cells, hemoglobin and packed cell volume. This difference may be due to the loss of epithelial cells of intestine and reduce absorptions from the villi, resulting diarrhoea, dehydration and anemia (
Al-dujaily et al., 2017). Total leukocyte counts were significantly higher in (11.65±0.13) goats with cryptosporidiosis as comparison with healthy goats (7.86±0.12). These findings were in accordance with earlier workers
(Thakre et al., 2016; Aziz et al., 2021). Contrary to the present findings
Shobhamani et al. (2007) reported lower values of TLC in
cryptosporidium infected calves. The infection with
cryptosporidium or any other parasite may predispose to the animals for secondary bacterial invasions which lead to the increased total leukocyte counts. There was a significant (P<0.05) increase in neutrophil counts in infected goats (46.50±0.45) as compared to control group (37.80±0.29) (Table 2). These findings were in agreement with
Thakre et al., (2016) in calves. Intestinal inflammation and acute enteritis may be the cause of neutrophilia in the present study. There was a significant decrease in lymphocyte count in goats with cryptosporidiosis. These findings were accordance with the findings of
Thakre et al. (2016) in calves. Contrary to the present findings
Khan et al., (2020) reported increased lymphocyte count in
cryptosporidium infected goats. Decreased lymphocyte count may be due to stress and depletion of lymphoid follicle. The values of eosinophil counts were significantly (P<0.05) higher (2.46±0.99) in infected goats than that of control group (1.40±0.16). The present finding was in agreement with
Khan et al. (2020) in goats. The elevation of eosinophils in circulating blood is common in parasitic infections of intestines (
Howard and Smith, 1999).
The significant increase in eosinophil count may be due to body defense mechanism as eosinophls are potent inflammatory cells that play an integral role in defense mechanism against parasites. The mean value of MCH was significantly higher in infected group. These finding were in agreement with the findings of
Thakre et al., (2016), who observed a significantly increased value of MCH in
Cryptosporidium infection. Contrary to the present findings
Darabus et al. (2009) reported reduction of MCH in cryptosporidium infected calves. Higher MCH value may be due to the dehydration and hemoconcentration arising from diarrhoea in
Cryptosporidium infected goats. The mean value MCV and MCHC increased but not significantly related between
Cryptosporidium infected group and control group.
There was a significant decrease value of albumin was observed in
cryptosporidium infected group (2.75± 0.0.11) as compared to that of healthy animals (3.23±0.13g/dl) (Table 3). Same findings were reported by
Khan et al. (2020) and
Aziz et al. (2021). Albumin is a negative acute phase protein and its concentration decreases during inflammation of intestine
(Hashemnia et al., 2014). The globulin value significantly decreased in
cryptosporidium infected goat. The present finding was in agreement with
Rekha et al. (2011) and
Mokhbatly and Selim (2003). The values of total proteins significantly decrease in infected group (5.54±0.04 g/dl) than that of healthy animals (6.53± 0.08 g/dl). The findings of present study were in accordance with earlier workers
(Molina et al., 1994; Shobhamani, 2005;
Rekha et al., 2011; Khan et al., 2020; Aziz et al., 2021). The Albumin/globulin ratio were decrease in
cryptospodium infected goats but it was not significantly related to the healthy animals. Similar findings reported by
Shobhamani (2005),
Rekha et al. (2011) and
Asati et al., (2008). The decrease in the albumin, globulin and total proteins may be due to the loss of above proteins in enteritis associated with
cryptosporidium infection. Here, our findings revealed significant decrease in total erythrocyte count, PCV, hemoglobin, lymphocyte count, total protein, albumin and globulin levels whereas increase in neutrophil, eosinophil and total leukocyte count in
Cryptosporidium infection.